The principle of operation of a d.c. motor can be described as follows:Whenever a current-carrying single loop conductor is placed in a magnetic field, a torque is created on the loop.
The torque causes the loop to rotate. If the loop is free to rotate, it will continue to rotate until it has completed a full revolution or until it is stopped.The basic principle behind the operation of a DC motor is that a current-carrying conductor experiences a force when it is placed in a magnetic field. This force is known as the Lorentz force. The magnitude of the force is proportional to the strength of the magnetic field, the current flowing through the conductor, and the length of the conductor in the magnetic field.A d.c. motor consists of two main components: a stator and a rotor.
The stator is a stationary component that consists of a series of permanent magnets arranged in a circular pattern around the rotor. The rotor is a rotating component that consists of a series of coils or windings placed on an armature.The current-carrying conductor placed in the magnetic field is the armature winding. When a current is passed through the armature winding, it experiences a force due to the magnetic field produced by the permanent magnets in the stator. This force causes the rotor to rotate. The direction of the force can be reversed by reversing the direction of the current in the armature winding.This is a brief description of the principle of operation of a d.c. motor. A long answer will include detailed information on the construction and working of a DC motor.
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Problems: Show your work wherever possible or no credit will be earned. 11. Calculate the force between 2 charges which each have a charge of +2.50µC and are separated by 1.25cm. | F= K 19₁1 19₂1 Flo F= 8.99x10²N.m²/C² (+2.50 uc) (2.50 m²) 0.6252 5.61875x1010 0.390625 I 3315 figs (F = 1.44 N A 12. Calculate the force on a 2.00μC charge in a 1.80N/C electric field.
When two charges Q1 and Q2 are separated by distance R, then the force between the two charges is given as:
F = k(Q1Q2)/R²Here,k = 8.99 x 10^9 N m²/C²Q1 = Q2 = + 2.50 µCR = 1.25 cm = 0.0125 m
Substituting the values in the above equation:
F = (8.99 x 10^9) (2.50 x 10^-6)² / (0.0125)²= 1.44 x 10^-3 N.
The force between two charges is 1.44 x 10^-3 N.12. Calculation of force on a charge due to electric fieldThe formula to calculate the force on a charge due to an electric field is:
F = QEWhere,Q = 2.00 µCE = 1.80 N/C
Substituting the values in the above equation:F = (2.00 x 10^-6) (1.80)F = 3.60 x 10^-6 NAnswer: The force on a 2.00 µC charge in a 1.80 N/C electric field is 3.60 x 10^-6 N.
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MOMEZTUM AND KINETICENERGY INTEGRALS In the pecvious two subsoctions, we have scen how the Oban- Salka sheme my be tset on sct up simple tecurrence relations for the gencritioa of the x,y and z coepootiss of the cne-ciectron integrals mer moltipole-toment and gifferential operators. These poc-fimensiceal ietegrah may also be combined to yield osher important imegnals - amely, the integrale for linear and asgular momenum as well as the kinetic-energe inlegralis:
P
i
=−1(G
2
∣∇∣G
k
)
1
i
=−i(G
k
∣r×∇∣G
k
)
T
ωs
=−1(G
0
∣
∣
∇
2
∣
∣
G
k
)
Expanding the operators appearing in these imegrals and factorizing in the Cartecian directions, we arrive at the following expressions for the z componconts of the momertam integents P
a
t
i
=−i5
ej
0
s
2i
0
D
m
t
L
[infinity]
∗
=−i/S
ij
1
D
ij
1
S
m
p
−D
ij
2
s
i
t
s
m=
0
) 349 and for the kinctic-energy integral T
at
=−
2
1
(D
ej
2
S
j
0
s
m
0
+S
ij
0
D
j
2
s
m+
0
+S
ij
0
s
ji
0
D
m
2
) in termas of the basic one-dimensional insegrals S
jj
and D
j
F
. Obvioasly, a large number of antegnals may be geacrated by application of the basic Obara-Saika recurrence relations. Again, with the different integral rypes, there are often a namber of possible approaches. We may thus write the kinetic-energy infegrals also in the form T
as
=T
ij
S
U
S
ma
+S
ij
T
w
S
wx
+S
i,
S
i
T
m
where, for example T
ij
=−
2
1
(G
i
∣
∣
∂r
2
∂
2
∣
∣
G
j
⟩= The Obara-Saika recurrence relations for these one-dimensional kinetic-eoergy integrals may be obcained from (9.3.26)−(9.3.28) as [5] T
i+1,j
=X
BA
T
ij
+
2p
1
(ωT
i−1,j
+jT
i,j−1
)+
p
b
(2aS
i+1,j
−L
j−1,j
) T
ij+1
=X
Fi
T
ij
+
2
p
1
(iT
i−1,j
+jT
ij−1
)+
p
a
(2hS
k+t+1
−1S
ij−1
) T
ω0
=[a−2a
2
(x
p+2
2
+
2p
1
)]S
i0
The kinetic energy integrals and momentum integrals are very important. These integrals have the following expressions for the z-component of the momentum integrals and kinetic energy integrals.
For momentum integrals,
Pati = -i5 ej0s 2i0 DmtL[∞]*
= -i/Sij1 Dij1 SmP - Dij2sit sm
= 349.·
For kinetic energy integrals,
Tati = -2(Dej2 Sj0 sm0 + Sij0 Dj2 sm+0 + Sij0 sji0 Dm
2) in terms of the basic one-dimensional integrals Sjj and DjF.It is obvious that by applying the basic Obara-Saika recurrence relations, a large number of integrals can be generated. There are often a number of possible approaches with different integral types.
We can thus write the kinetic-energy integrals also in the form
T as =Tij SU Sma + Sij Tw Swx + Si, Si Tm where
Tij = -2(Gi∣∣∂r2∂2∣∣Gj⟩ = -2(Gj∣∣∂r2∂2∣∣Gi⟩.
The Obara-Saika recurrence relations for these one-dimensional kinetic-energy integrals can be obtained from (9.3.26) − (9.3.28) as T i+1,j
= XBA T ij + (2p1) (ωT i−1,j + jT i,j−1) + pb (2aS i+1,j − L j−1,j)T ij+1
= XFiT ij + (2p1)(iT i−1,j + jT ij−1) + pa(2hSk+t+1 − 1Sij−1)T ω0
= [a−2a2 (xp+22+2p1)]S i0.
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A second baseman tosses the ball to the first baseman, who catches it at the same level from which it was thrown. The throw is made with an initial speed of 19.0 m/s
at an angle of 35.5 ∘ above the horizontal. Let upward be the positive y
direction.
A) What is the y component of the ball's velocity?
Express your answer to three significant figures.
vy=? m/s
B)What is the ball's direction of motion just before it is caught?
Express your answer to three significant figures.
θf=?
A second baseman tosses the ball to the first baseman, who catches it at the same level from which it was thrown. The throw is made with an initial speed of 19.0 m/s at an angle of 35.5 ∘ above the horizontal. Let upward be the positive y direction.
direction.
A) The y component of the ball's velocity (vy) is 10.9 m/s.
B) The ball's direction of motion just before it is caught is 35.5 degrees above the horizontal.
A) To find the y component of the ball's velocity (vy), we can use the given initial speed and launch angle. The y component can be calculated using the formula:
vy = v * sin(θ)
where v is the initial speed and θ is the launch angle.
Plugging in the values:
vy = 19.0 m/s * sin(35.5°) = 10.9 m/s
Therefore, the y component of the ball's velocity is 10.9 m/s.
B) The direction of motion just before the ball is caught can be determined by the launch angle. The launch angle of 35.5 degrees is measured above the horizontal. Since the ball is being thrown from the second baseman to the first baseman, the direction of motion just before it is caught will be the same as the launch angle.
Therefore, the ball's direction of motion just before it is caught is 35.5 degrees above the horizontal.
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question 55
55. Fifty grams of water at \( 0^{\circ} \mathrm{C} \) are changed into vapor at \( 100^{\circ} \mathrm{C} \). What is the change in entropy of the water in this process?
The change in entropy of the water during the phase change from a liquid to a vapor is positive.
Entropy is a measure of the disorder or randomness of a system. In this case, we have water undergoing a phase change from a liquid to a gas. As the water molecules gain energy and transition from the lower energy state of a liquid to the higher energy state of a gas, the disorder of the system increases. This increase in disorder corresponds to an increase in entropy.
When water is heated from [tex]\( 0^{\circ}[/tex] [tex]\mathrm{C} \)[/tex] to [tex]\( 100^{\circ} \mathrm{C} \)[/tex], it absorbs energy in the form of heat. This energy causes the water molecules to gain kinetic energy and eventually break free from the intermolecular forces holding them together. As the liquid water evaporates and turns into vapor, the molecules become more dispersed and move more freely. This increase in molecular randomness leads to a higher entropy.
Overall, the change in entropy of the water in this process is positive because the transition from a liquid to a gas involves an increase in disorder and molecular randomness.
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(a) An air-filled metallic rectangular waveguide is used as a tunnel with dimensions, a = 4 m and b = 16 m. Analyze whether the tunnel can pass a 1.8 MHz AM broadcast signal. The cutoff frequencies for TE02 and TM₁1 modes are both equal to 10 GHz. Determine the dimensions of the air-filled rectangular waveguide and analyze whether the dominant mode will propagate in the waveguide at 9 GHz. (16 marks)
The air-filled metallic rectangular waveguide cannot pass a 1.8 MHz AM broadcast signal due to its large dimensions, as the signal wavelength is significantly larger. The dominant mode will not propagate in the waveguide at 9 GHz, as its frequency is below the cutoff frequency of the TE10 mode.
A rectangular waveguide can only propagate modes with frequencies above the cutoff frequency of the mode. The cutoff frequency for the TE10 mode is approximately given by fc = c/2a, where c is the speed of light and a is the smaller dimension of the waveguide. Substituting the given values, we get fc = 1.87 GHz, which is below the 9 GHz signal frequency, indicating that the TE10 mode will not propagate in the waveguide at 9 GHz.
The dimensions of the waveguide are too large to support the propagation of a 1.8 MHz signal due to its longer wavelength. Therefore, the waveguide cannot pass the 1.8 MHz AM broadcast signal. The cutoff frequencies for the TE02 and TM11 modes are both equal to 10 GHz, which is well above the 9 GHz signal frequency, indicating that these modes will not propagate in the waveguide at 9 GHz.
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2) Suppose you wanted to use an electron microscope to see individual atoms that visible light can't see. Would you want fast moving electrons or slow moving electrons? Why?
Fast moving electrons would be better than slow moving electrons to see individual atoms that visible light can't see.
An electron microscope is a type of microscope that uses electrons instead of visible light to produce an image. The wavelength of electrons is much shorter than that of visible light, which allows electron microscopes to produce much higher-resolution images. The two types of electron microscopes are transmission electron microscopes (TEMs) and scanning electron microscopes (SEMs).
A TEM works by firing a beam of electrons through a thin specimen, allowing the electrons to pass through the specimen and create an image on a screen. SEMs, on the other hand, fire a beam of electrons at the surface of a specimen and use the reflected electrons to create an image.
While both types of electron microscopes use electrons to produce images, the speed of the electrons is an important factor in their ability to resolve individual atoms. In order to see individual atoms, the electrons need to have a very short wavelength, which requires them to be moving very quickly. Therefore, fast moving electrons would be better than slow moving electrons to see individual atoms that visible light can't see.
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In an AC circuit a sinusoidal voltage with peak amplitude of 250 volts is applied to a resistance with a value of 250 Ω. What is the value of the power dissipated in the resistor?
The answer is 125 W.In an AC circuit, a sinusoidal voltage with peak amplitude of 250 volts is applied to a resistance with a value of 250 Ω.
The value of the power dissipated in the resistor is 250 W when the rms voltage is equal to the peak voltage divided by the square root of 2. This can be calculated using the formula P = V^2/R where V is the rms voltage and R is the resistance value.
In this case, the peak voltage is 250 volts, so the rms voltage can be calculated as follows:Vrms = Vp/√2 = 250/√2 ≈ 176.78 volts Substituting these values into the formula for power, we get:P = V^2/R = (176.78)^2/250 = 125 W Therefore, the value of the power dissipated in the resistor is 125 W.
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A small stone has a mass of 1 g or 0.001 kg. The stone is moving with a speed of 12.000 m/s (roughly the escape speed). (a) a. What is wavelength of the stone? Report your answer to 2 decimal places, in scientific notation, and do NOT include units of measure. Wavelength = ×10 to the power of meters (b) Comment on why we do not "see" this wave nature of the stone. The Planck's constant h is 6.6×10 −34
J⋅s. (where 1 J⋅s=kg⋅m 2
/s ).
(a) The wavelength of the stone is approximately 5.50 × 10⁽⁻³⁴⁾⁾ meters. (b) We do not perceive the wave nature of macroscopic objects like stones due to their extremely small wavelengths, which are far below the scale of our everyday experiences.
(a) To find the wavelength of the stone, we can use the de Broglie wavelength formula:
λ = h / (m * v)
where:
λ = wavelength
h = Planck's constant (6.6×10⁽⁻³⁴⁾⁾ J⋅s)
m = mass of the stone (0.001 kg)
v = velocity of the stone (12.000 m/s)
Substituting the given values into the formula:
λ = (6.6×10⁽⁻³⁴⁾⁾ J⋅s) / (0.001 kg * 12.000 m/s)
Calculating this, we get:
λ = 5.50 × 10⁽⁻³⁴⁾⁾ meters
Therefore, the wavelength of the stone is approximately 5.50 × 10⁽⁻³⁴⁾⁾ meters.
(b) We do not perceive the wave nature of macroscopic objects like stones because their wavelengths are incredibly small compared to the scale of our everyday experiences. In the case of the stone mentioned, the wavelength is on the order of 10⁽⁻³⁴⁾⁾meters, which is many orders of magnitude smaller than anything we can observe directly. Our visual perception is limited to wavelengths within the visible light spectrum, which ranges from approximately 400 to 700 nanometers (10⁽⁻⁹⁾ meters). Therefore, the wave nature of the stone is not detectable by our senses. We need specialized equipment and experiments to observe the wave-like behavior of such small particles.
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a. Starting from the power transmitted from the transmitter; derive an expression for the saturation flux density. Explain how this influences the carrier to noise power spectral density ratio of a sa
Starting from the power transmitted from the transmitter, the expression for the saturation flux density can be derived as follows;The power transmitted from the transmitter is given byP = VI watts where V is the voltage at the transmitter terminals and I is the current flowing into the antenna.
The total flux density in the medium is given by:B = μ₀(H + M)TeslaWhere;B = Total flux density in the mediumH = Magnetic field strength in the mediumM = Magnetization of the medium due to the magnetic field strength.The saturation flux density is given by the maximum value of the flux density that can be obtained for a given magnetic field strength in the medium.
If we consider a magnetic medium in which the magnetic field is increased from zero to a certain level, the magnetization will also increase with the magnetic field strength up to a certain level after which further increase in the magnetic field strength will not lead to a corresponding increase in the magnetization level.
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An aluminum rectangular waveguide with dimensions a=4.2cm and b=1.5cm filled with Teflon (&r=2.6) operates at 3GHz. a. Determine the range of frequencies for which the guide will operate single mode TE10 b. Calculate the impedance at dominant mode
The impedance at the dominant mode (TE10) of the rectangular waveguide is approximately 192.4 ohms.
The range of frequencies for which the aluminum rectangular waveguide will operate in the single mode TE10, we need to consider the cutoff frequency for the TE10 mode.
a. Cutoff Frequency for TE10 Mode:
The cutoff frequency (fc) for the TE10 mode can be calculated using the formula:
fc = c / (2 * √(εr - 1) * a)
Where:
c is the speed of light in vacuum (3 x 10^8 m/s)
εr is the relative permittivity of Teflon (2.6)
a is the width of the waveguide (4.2 cm = 0.042 m)
Substituting the given values into the formula, we can calculate the cutoff frequency:
fc = (3 x 10^8 m/s) / (2 * √(2.6 - 1) * 0.042 m)
fc ≈ 5.56 GHz
Therefore, the waveguide will operate in the single mode TE10 for frequencies below the cutoff frequency of 5.56 GHz.
b. Impedance at Dominant Mode (TE10):
The characteristic impedance (Z0) at the dominant TE10 mode of the rectangular waveguide can be calculated using the formula:
Z0 ≈ 60 / √(εr - 1) * (b / a)
Where:
εr is the relative permittivity of Teflon (2.6)
a is the width of the waveguide (4.2 cm = 0.042 m)
b is the height of the waveguide (1.5 cm = 0.015 m)
Substituting the given values into the formula, we can calculate the impedance:
Z0 ≈ 60 / √(2.6 - 1) * (0.015 m / 0.042 m)
Z0 ≈ 192.4 ohms
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3. Tentbook problem \( 2.16 \) PROBLEM 2.16. The rod AMCD is tade of an aluminum for which \( 2=70 \) OPa. Por the loadery samen, determine the defiection of (a) paint \( A,(b) \) point \( D \)
The given rod is AMCD made of aluminum with the modulus of elasticity of E=70 GPa. The deflection of point D is 0.13 mm.
The load applied is such that the deflection of the rod has to be calculated at points A and D respectively.
(a) Deflection at point A:
Let P be the load acting at point A.
Let the deflection at point A be δ.
Then, from the theory of elasticity,δ = PL/2AEQ 2.16
Thus,δ = 20 × 0.75^3/(2 × 70 × 10^3 × (π/4) × 0.75^4)
= 0.195 mm
Therefore, the deflection of point A is 0.195 mm.
(b) Deflection at point D:Let the deflection at point D be δ.Then, from the theory of elasticity,
δ = PL/3AEQ 2.16
Thus,
δ = 20 × 0.75^3/(3 × 70 × 10^3 × (π/4) × 0.75^4)
= 0.13 mm
Therefore, the deflection of point D is 0.13 mm.
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The resistance of a wire is given as R-Rof1+a(T-15)] where Ro-7520.1% is the resistance at 15 °C, a-0.004 °C 1% is the resistance coefficient, and the temperature of the wire is T -351 "C. Calculate the resistance of the wire and its uncertainty. AR ak ak + ++ MX= --)] 7 are
The resistance of the wire is `6016.08 Ω` and its uncertainty is `± 16.7872 Ω`.
The resistance of the wire is given as,
`R= Ro[1+a(T-15)]`
Putting the values, we get,
R`= 7520.1 Ω[1+0.004 Ω/°C(-35-15)]
``R`= 7520.1 Ω[1+0.004 Ω/°C(-50)]
`R`= 7520.1 Ω[1-0.2]
R`= 6016.08 Ω
Uncertainty in resistance (δR) is given as,`δR= |∂R/∂Ro|δRo + |∂R/∂a|δa + |∂R/∂T|δT``δR
= |[1+a(T-15)]|δRo + |Ro(T-15)|δa + |Ro(a)|δT`
Now,`δRo = 7520.1 × 0.1/100 = 7.5201``
δa = 0.004 × 1/100 = 0.00004``δT = 0.5 °C` [As the instrument uncertainty is ±0.5°C]
Substituting the values,`δR = |[1+0.004(-35-15)]|×7.5201 + |7520.1(-35-15)|×0.00004 + |7520.1(0.004)|×0.5``δR
= 0.2408 + 1.50601 + 15.0404``δR = 16.7872 Ω
Therefore, the resistance of the wire and its uncertainty is,`R = 6016.08 Ω ± 16.7872 Ω
The resistance of the wire is `6016.08 Ω` and its uncertainty is `± 16.7872 Ω`.
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A bicyclist travels in a circle of radius 25 m at a
constant speed of 8.7 m/s. The combined mass of the bicycle and rider is 85 kg. Calculate the force -magnitude and angle with the vertical -exerted by the road on the bicycle.
To calculate the force exerted by the road on the bicycle, we need to consider the centripetal force acting on the bicycle. The centripetal force is the force that keeps an object moving in a circular path.
Given: Radius of the circle, r = 25 m Speed of the bicycle, v = 8.7 m/s Mass of the bicycle and rider, m = 85 kg The centripetal force can be calculated using the formula: F = (m * v^2) / r Let's substitute the given values into the formula: F = (85 kg * (8.7 m/s)^2) / 25 m Calculating the expression inside the parentheses: F = (85 kg * 75.69 m^2/s^2) / 25 m Simplifying the expression: F = 256.56 N So, the magnitude of the force exerted by the road on the bicycle is 256.56 N. To find the angle with the vertical, we need to consider that the centripetal force acts towards the center of the circle. Since the road is horizontal, the angle with the vertical is 90 degrees. Therefore, the force exerted by the road on the bicycle has a magnitude of 256.56 N and is perpendicular to the road.
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21. [-/5 Points] The 1 kg standard body is accelerated by only F₁ = (5.0 N) ↑ + (7.0 N) ĵ and F₂ = (−8.0 N)î + (−6.0 N) ĵ. (a) What is the net force in unit-vector notation? F net = DETAILS HRW10 5.P.097. N (b) What is the magnitude and direction of the net force? magnitude direction N ° counterclockwise from the +x-axis (c) What is the magnitude and direction of the acceleration? magnitude m/s² direction ° counterclockwise from the +x-axis MY NOTES ASK YOUR TEACHER
(a) Net force in unit-vector notation The 1 kg standard body is accelerated by F₁ and F₂. Net force is the vector sum of these two forces: [tex]Fnet=F₁+F₂= (5.0 N) ↑ + (7.0 N) ĵ + (−8.0 N)î + (−6.0 N) ĵ = (−3î + N ĵ)N(b)[/tex]
Magnitude and direction of the net force Net force is given as Fnet = −3î + N ĵMagnitude of the net force, Fnet= [tex]√Fnet,x² + Fnet,y²= √(−3 N)² + (1 N)²= √9 + 1= √10 NT[/tex]he direction of the net force in unit-vector notation = tan−1(Fnet,y / Fnet,x)
The direction of the net force in degrees,[tex]θ, = tan−1 (Fnet,y / Fnet,x) = tan−1(1/−3)= −18°[/tex]
Therefore, the magnitude and direction of the net force are √10 N and 18° counterclockwise from the +x-axis, respectively.
(c) Magnitude and direction of the acceleration The acceleration of the 1 kg standard body is given by the Newton's Second Law of motion as:
Fnet = ma,where m is the mass of the body and a is its acceleration.a = Fnet/mThe mass of the body is m = 1 kg, while the net force on it is Fnet = −3î + N ĵ.
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Q.2: (a) A person receives 0.01 mGy dose from a radiation, and another person receives 0.04 mGy from thermal neutron radiation. Who is at greatest risk of cancer? Explain your answer.
(b) A patient has received a committed equivalent dose of 0.3 Sv to her stomach during a year. What additional, uniform, whole-body external gamma-radiation dose could she receive without technically exceeding the
NCRP annual limit on effective dose?
(a) The person who receives 0.04 mGy from thermal neutron radiation is at a greater risk of cancer. Explanation: Different types of radiation have different levels of biological effectiveness. Thermal neutron radiation is known to have higher biological effectiveness compared to other types of radiation, such as non-ionizing radiation.
Therefore, even though the dose received by the first person is higher, the second person is at a greater risk of cancer due to the higher biological effectiveness of thermal neutron radiation.
(b) The additional, uniform, whole-body external gamma-radiation dose the patient could receive without technically exceeding the NCRP annual limit on effective dose would depend on the specific annual limit set by the NCRP. To provide a specific answer, the NCRP annual limit on effective dose needs to be known. Without that information, it is not possible to determine the exact additional dose she could receive while staying within the limit.
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A box of mass m sits on a plane inclined at an angle, . What is the relationship between the weight of
the box, W, and the normal force exerted on the box, N?
A. W > N
B. W = N
C. W < N
D. W = 2N
E. Cannot be determined. / Kan nie bepaal word nie.
The normal force and the weight of an object are related on an inclined plane. When a box of mass m is placed on an inclined plane, the weight of the box, W, and the normal force exerted on the box, N, are related as shown below:
Answer and explanation:For an object on an inclined plane, the weight of the object, W, can be broken down into two components: one parallel to the plane and one perpendicular to the plane. The perpendicular component of the weight is equal and opposite to the normal force, N, exerted by the plane on the object.
Therefore, the relationship between W and N on an inclined plane is given by:N = W cosθAnd the relationship between the parallel component of the weight, Wp, and the force of friction, f, on the object is given by:f
= Wp sinθThe angle of inclination of the plane, θ, is usually given in degrees. If necessary, it can be converted to radians using the formula:θ (radians) = θ (degrees) × π / 180
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A hydrogenic ion with Z = 13 is excited from its ground state to
the state with n = 3. How much energy (in eV) must be absorbed by
the ion?
Enter a number with one digit after the decimal point.
Hydrogenic ions are a kind of ion which consists of a bare nucleus and a single electron. Hydrogen and hydrogen-like ions are referred to as hydrogenic ions. The properties of hydrogenic ions are the same as those of hydrogen. Hydrogenic ions are classified according to the number of protons in their nuclei and the corresponding electron in their shells. They are characterized by the ionization energy that must be overcome to free the electron from its nucleus.
To calculate the energy required to excite a hydrogenic ion, we'll use the Rydberg formula, which is given below:
E = -\frac{13.6 Z^2}{n^2}Here, the hydrogenic ion has Z=13, and it is excited to the state with n = 3. Therefore, substituting these values in the above equation,we get :
E = -\frac{13.6 (13)^2}{3^2}E = -\frac{13.6 \times 169}{9}E = -\frac{2294.4}{9}The energy absorbed by the ion is:
E = 254.933 \text{ eV}Therefore, the energy absorbed by the ion is 254.9 eV (rounded off to one decimal place).Hence, the answer is 254.9.About Hydrogenic ionsHydrogenic ions is a hydrogen atom that has a different number of electrons than normal. The positively charged hydrogen ions are called cations, and the negative ones are called anions. Hydrogen ion is the general term recommended by the IUPAC for all hydrogen ions and their isotopes. Atoms with a small atomic number tend to lose electrons to become stable. Thus, the hydrogen atom will tend to release 1 electron to become stable so that only 1 proton remains. Because the proton is positively charged, the hydrogen atom will become a positive ion, namely H^+.
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Listen An infinitely long cylindrical shell extending between r = 1 m and r = 3 m contains a uniform charge density pv0. Apply Gauss's law to find D in the region r > 3m. (a) Setup equations (b) Show work (c) Final answer
a) Gauss's law can be expressed in integral form as shown below:∫E·dA = Qenc/ε₀ ; b) D in the region r > 3m can be found using the relation D = ε₀E ; c) the final answer is: D = 4 ρv₀r .
(a) Setup equations: We have a cylindrical shell with uniform charge density, ρv₀ .Gauss's law relates the flux of the electric field over a closed surface with the charge enclosed within the surface. Using Gauss's law, the electric field can be found by integrating over a closed surface containing the charge.
Gauss's law can be expressed in integral form as shown below:∫E·dA = Qenc/ε₀ Where, E is the electric field, Qenc is the charge enclosed by the closed surface, and ε₀ is the permittivity of free space. We can choose a cylindrical surface with radius r > 3m and height h that encloses the cylinder of charge. Since the cylinder is infinitely long, the electric field should be uniform and have a direction perpendicular to the cylindrical surface.
The charge enclosed by the cylindrical surface of radius r and height h can be found as: Qenc = ρv₀ × V Where V is the volume of the cylindrical shell. The volume of the cylindrical shell with inner radius r1 and outer radius r₂ can be found as: V = π(h) [r₂² - r₁²]
Therefore, the charge enclosed by the cylindrical surface is given by: Qenc = ρv₀ × π(h) [3² - 1²],
Qenc = ρv₀ × π(h) × 8
∴ Qenc = 8 πρv₀h
The electric field on the cylindrical surface of radius r > 3m can be found as:
E = Qenc/2πrLε₀ Where L is the length of the cylindrical shell. Since the cylinder is infinitely long, L can be taken as infinite.
Therefore, E = Qenc/2πrLε₀ can be rewritten as:
E = 4 ρv₀r/ε₀
(b) Show work : D in the region r > 3m can be found using the relation D = ε₀E
We have E = 4ρv₀r/ε₀
Therefore,
(c) Final answer D = ε₀ × [4ρv0r/ε₀]D
= 4ρv₀r
Hence, the final answer is: D = 4 ρv₀r where r is in meters.
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Find the value of the constant A that normalizes the wavefunction shown below in the first excited state. ¥(x, y, z, t) = A sin(kıx)sin (kqy)sin (k3z) e – iwt for 0 < x, y, z
The value of the constant A that normalizes the wavefunction shown below in the first excited state. ¥(x, y, z, t) = A sin(kıx)sin (kqy)sin (k3z) e – iwt for 0 < x, y, z is L^9 / 2^22.
For a wavefunction to be normalized, the integral of the square of the wavefunction should be equal to 1 over all space and time. That is
∫∫∫│¥(x, y, z, t)│^2 dxdydz = 1
Substituting the given wave function,
∫∫∫│A sin(kıx)sin (kqy)sin (k3z) e – iwt│^2 dxdydz = 1
∫∫∫ A^2 sin^2(kx)sin^2(ky)sin^2(kz) dx dy dz = 1
Since this is a normalized wave function we can say that the value of the above integral is equal to 1. Hence,
A^2 = 1/∫∫∫sin^2(kx)sin^2(ky)sin^2(kz) dx dy dz
We know that sin²x can be written as ½ - ½cos2x and applying that to sin²kx we get,
sin²(kx) = ½ - ½cos2(kx)
Therefore,
A^2 = 1/∫∫∫(½ - ½cos2(kx))(½ - ½cos2(ky))(½ - ½cos2(kz)) dx dy dz
A^2 = 1/8 * ∫∫∫(4 - 2(cos2(kx) + cos2(ky) + cos2(kz)) + cos2(kx)cos2(ky)cos2(kz)) dx dy dz
The limits of integration are not given in the question so we will assume them to be from 0 to L in all three directions.
A^2 = 1/8 * ∫∫∫(4 - 2(cos2(kx) + cos2(ky) + cos2(kz)) + cos2(kx)cos2(ky)cos2(kz)) dx dy dz
= 1/8 * ∫∫∫(4 - 2(cos²(kx) + cos²(ky) + cos²(kz)) + cos²(kx)cos²(ky)cos²(kz)) dx dy dz
= 1/8 * ∫∫∫(2 + cos²(kx)cos²(ky)cos²(kz)) dx dy dz
= 1/8 * ∫₀ˡ sin²(kx)dx * ∫₀ˡ sin²(ky)dy * ∫₀ˡ sin²(kz)dz
Since we are finding A^2 we can use this formula,
∫₀ˡ sin²(ax)dx = L/2
So,
A^2 = 1/8 * L³/8 * L³/8 * L³/8
A^2 = L^9 / 2^21
A = (L^9 / 2^21)^(1/2)
A = L^9 / 2^22
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Designed for use in Turkey, the 50kW synchronous generator has a synchronous speed of 600 revolutions per minute. This generator will be to exported the United States, where power lines operate at 60 hertz. (a) What is the current pole count of the synchronous generator? (b) How many poles must the generator have to operate at the same synchronous speed in the United States?
Therefore, the generator must have 12 poles to operate at the same synchronous speed in the United States.(a) Current pole count of the synchronous generator is 10 Pole(b) Number of poles that the generator must have to operate at the same synchronous speed in the United States are 12 poles.
Explanation:The formula to calculate synchronous speed is given by;f = P × NSwhere,
f = Supply Frequency
P = Number of Poles
NS = Synchronous SpeedGiven that the synchronous generator has a synchronous speed of 600 revolutions per minute and the power lines in the United States operate at 60 hertz. Now,We know that supply frequency in the US is 60 HzSo, the synchronous speed of the generator a
t 60Hz = 120*60/2
= 3600 RPM(a) What is the current pole count of the synchronous generator?At 50Hz, the synchronous speed of the generator = 600 RPM,Therefore,
f = P * NSSo, the pole count
P = f/NS
= 50/600
= 1/12Then pole count
P = 1/frequency × NS= 1/50 × 600
= 12 polesTherefore, the current pole count of the synchronous generator is 10 Pole.(b)
In the United States, the power line operates at a frequency of 60 Hz. Therefore, the synchronous speed of the generator at 60 Hz can be calculated as;f = P × NS60
= P * 600NS
= 600/PNow, as per the above equation, the generator will have to have fewer poles so that the synchronous speed remains constant. Therefore, the generator must have 12 poles to operate at the same synchronous speed in the United States.
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In your workplace, you are required to make a presentation to introduce oscillation concepts and circuits. Your presentation should include, but not limited to: a. Explain the concept of oscillations
Oscillation is an extremely significant concept in various applications, particularly in electronics and electrical engineering. An oscillation can be defined as the recurrent movement of an object around an equilibrium point, such that it continues to return to the equilibrium point despite being pushed away from it.
The concept of oscillation can be understood by visualizing a pendulum attached to a clock or by considering a spring's behavior. The electrical energy that flows back and forth between the inductor and the capacitor in an LC circuit is referred to as an oscillation.
The frequency of oscillation is the number of oscillations per unit time and is expressed in Hertz. Oscillations that occur at a frequency of more than 20 kHz are referred to as high-frequency oscillations. The sinusoidal waveform is often used to represent oscillations, and it may be plotted on an x-y chart to demonstrate how the wave changes over time. The voltage produced in an electrical circuit when it oscillates back and forth is referred to as an oscillating voltage.
Circuits that oscillate are known as oscillator circuits, and they are used in a variety of applications, including radio and television broadcasting, radar systems, and digital clocks. To summarize, the concept of oscillation is crucial in electronic and electrical applications, and its understanding is essential for the development of advanced electronic systems.
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A 1000-lb shell is fired from a 200,000-lb cannon with a
velocity of 2000 ft per sec. Find the moduluss of a nest of springs
that will limit the recoil of the cannonto 3ft.
The value of the modulus of a nest of springs that will limit the recoil of the cannon to 3ft is: k = 4.63 x 10¹⁰ lb/ft.
Given data: Weight of the shell, W = 1000 lb
Velocity of the shell, v = 2000 ft/s
Weight of the cannon, M = 200000 lb
Limiting recoil of the cannon, x = 3 ft
We have to determine the modulus of a nest of springs that will limit the recoil of the cannon to 3 ft.
Concept used:
The momentum equation can be used to solve the problem as below:
Momentum before firing = Momentum after firing
Therefore, the momentum of the cannon and shell should be equal and opposite as the momentum of the system is conserved.
The momentum of the cannon and the shell is given by Mv and W (-v), respectively.
Therefore, the momentum equation is given by:
Momentum before firing = Momentum after firing
Mv = -Wv Or
Mv + Wv = 0
The equation shows that the velocity of the cannon in the opposite direction is given by:
V = - (W/M) v
We have to find the force needed to limit the recoil of the cannon to 3 ft.
For this, we need to use the work-energy principle.
The work-energy principle states that the net work done on the system is equal to the change in kinetic energy of the system.
Therefore, the work done by the force (spring) is given by:
Work done = Change in kinetic energy -w = ΔKE
Total work done by the force is given by:
w = 0.5 k x², where k is the modulus of the spring
Hence, the equation becomes as below:
0.5 k x² = ΔKE
We need to determine the change in kinetic energy of the cannon and shell.
The change in kinetic energy of the cannon and shell is given by the equation:
ΔKE = (1/2)MV²
After substituting the values, we get:
ΔKE = (1/2)200000(46.51)² = 2.08 x 10¹¹ ft.lb
Therefore, the value of the modulus of a nest of springs that will limit the recoil of the cannon to 3ft is:
k = ΔKE/(0.5 x x²)
= (2.08 x 10¹¹)/(0.5 x 3²)
= 4.63 x 10¹⁰ lb/ft
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Please answer in one hour
A hydrogen molecule is made of 2 hydrogen atoms that each have a mass of 1.6x10-27 kg.
The molecule naturally vibrates with a frequency of 8.25x1014 Hz.
What is the force between the two atoms in the hydrogen molecule?
We are given the mass of each hydrogen atom in a hydrogen molecule and the frequency at which the molecule vibrates.
We are asked to calculate the force between the two hydrogen atoms in the molecule.
The force between the two atoms in a molecule can be calculated using Hooke's Law, which states that the force exerted by a spring is proportional to the displacement from its equilibrium position.
In this case, we can consider the vibration of the hydrogen molecule as a harmonic oscillator, similar to a mass-spring system. The frequency of vibration, denoted by f, is related to the force constant (k) and the reduced mass (μ) of the system by the equation f = (1/2π) √(k/μ).
To calculate the force, we need to determine the force constant (k). Using the equation for frequency, we can rearrange it to solve for k:
k = (4π²μf²)
The reduced mass (μ) of the system is given by μ = (m₁m₂)/(m₁ + m₂), where m₁ and m₂ are the masses of the hydrogen atoms.
Substituting the given values, we have:
m₁ = m₂ = 1.6x10⁻²⁷ kg
f = 8.25x10¹⁴ Hz
Calculating the reduced mass:
μ = (1.6x10⁻²⁷ kg * 1.6x10⁻²⁷ kg) / (1.6x10⁻²⁷ kg + 1.6x10⁻²⁷ kg)
= 8x10⁻²⁸ kg
Now, plugging the values of μ and f into the equation for k, we get:
k = (4π² * 8x10⁻²⁸ kg * (8.25x10¹⁴ Hz)²)
Finally, the force (F) between the two atoms can be calculated using the equation F = k * x, where x is the displacement from equilibrium.
Please note that the actual calculation of the force requires the specific displacement value or additional information.
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A listener finds that the sound level of a flute is 9 dB higher than the sound level of a cello. How does the intensity of the flute compare with the intensity of the cello?
I_f/I_c =
Therefore, the intensity of the flute is 0.9 times the intensity of the cello.
The formula to use for this problem is :
I_f/I_c
= (sound level of flute - sound level of cello) / 10.
Where I_f is the intensity of the flute
and I_c is the intensity of the cello.
Given that the sound level of a flute is 9 dB higher than the sound level of a cello, we can say that (sound level of flute - sound level of cello)
= 9 dB.
Substituting the given values in the formula,
I_f/I_c
= (sound level of flute - sound level of cello) / 10
= 9 / 10
= 0.9
Therefore, the intensity of the flute is 0.9 times the intensity of the cello.
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A photon with a wavelength of 5040 nanometers has a frequency of 5.95 e 13 cycles per second. What will be the wavelength (in nanometers) of a photon with a frequency of 3.57 e 14? Select one: A. 5040 nanometers B. 2520 nanometers C. 1260 nanometers D. 10080 nanometers
A photon with a wavelength of 5040 nanometers has a frequency of 5.95 e 13 cycles per second. The wavelength (in nanometers) of a photon with a frequency of 3.57 e 14 is 840 nanometers. There is no correct option.
To find the wavelength of a photon with a given frequency, we can use the equation:
c = λ * f
where c is the speed of light, λ is the wavelength, and f is the frequency.
Wavelength of the first photon ([tex]\lambda_1[/tex]) = 5040 nanometers
Frequency of the first photon (f1) = 5.95 * [tex]10^{13[/tex] cycles per second
We can rearrange the equation to solve for the wavelength:
[tex]\lambda_1 = c / f_1[/tex]
Now we can substitute the known values:
[tex]\lambda_1 = (3.00 * 10^8 m/s) / (5.95 * 10^{13} s^{(-1)})[/tex]
Converting the wavelength to nanometers:
[tex]\lambda_1 = (3.00 * 10^8 m/s) / (5.95 * 10^{13} s^{(-1))} * (10^9 nm / 1 m)[/tex]
Calculating the value of [tex]\lambda_1[/tex]:
[tex]\lambda_1[/tex]≈ 5040 nanometers
So, the wavelength of the first photon is 5040 nanometers.
Now, to find the wavelength of a photon with a frequency of 3.57 * [tex]10^{14[/tex]cycles per second:
[tex]\lambda_2[/tex] = c /[tex]f_2[/tex]
Substituting the known values:
[tex]\lambda_2[/tex] = [tex](3.00 * 10^8 m/s) / (3.57 * 10^{14} s^{(-1)}) * (10^9 nm / 1 m)[/tex]
Calculating the value of [tex]\lambda_2[/tex]:
[tex]\lambda_2[/tex] ≈ 840 nanometers
Therefore, the wavelength of the photon with a frequency of 3.57 *[tex]10^{14[/tex] cycles per second is approximately 840 nanometers.
The correct answer is not among the options provided.
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Predator UAV has a wing span of 14.85m, a maximum mass of 1020kg, and a fuel mass of 295kg. The power plant is a Rotax four-cylinder, four-stroke engine with a specific fuel consumption of 0.4kg of fuel per kW per hour, driving a two-blade variable-pitch pusher propeller with an efficiency of 0.8. The aircraft drag polar and Oswald efficiency factor can be assumed Cp = 0.03 +0.0236C2 and 0.7, respectively. Ignore the fuel for takeoff, landing, climb and descent. (a) Calculate the wing reference area of the aircraft. (b) Calculate the aircraft maximum range and endurance at a pressure altitude of 20,800ft and a temperature of -15°C.
In a mass-spring system with mass M and spring constant K, the natural frequency is given by the formula: f=12π⋅Mk. If the mass of the system increases, the frequency decreases and vice versa. A mass of 680kg is added to M, the natural frequency changes from 5.5Hz to 4.5Hz. The change in frequency of the system, Δf, is given by:
Δf=f1−f2
=12π⋅M+kM1−12π⋅M+ k(M+680)
Here,
f1=5.5Hz,
f2=4.5Hz,
M+ k=12π⋅5.5 and
(M+680)+k=12π⋅4.5
Δf=12π⋅M+ k(M+680)−12π⋅M+ k
=−12π⋅680M+k
680=−12π⋅680M+k
M+ k=−12π⋅680680
=4.6kg
Now, when the mass is replaced by 1000kg, the total mass of the system becomes M+1000kg.
The new natural frequency, f3 is given by:
f3=12π⋅(M+1000)k Substituting
M+k=4.6kg,
we get:
f3=12π⋅(4.6+1000)
k =12π⋅1004.6
k = 8.2 Hz (approx).
The new natural frequency is 8.2 Hz.
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A solid simply supported beam is loaded with a concentrated load at the top center. The support is assumed to be rigid. Geometry: 2"x1"×10" (depth x width x length) • Material: ASTM A 36 •Boundary condition: fixed at both ends •Force: 2,000 lbf at the center •Mesh: medium (default) •Analysis type: static a. Perform linear static analysis with solid elements for maximum displacement, stress b. Compare results with analytical results 1. Simulation Description a. SolidWorks Model b. Analysis (What kind of analysis is performed?) Units (Mention the System of Units used) C. d. Materials (Type of Materials, Materials Properties) Boundary Conditions (Type of Boundary Condition, Applied Locations) External Loading (Type of Loading, Applied Locations) g. Mesh (Type of elements, Characteristics Element Size, Number of Elements and Nodes) di 2. Results Von Mises Stress Plot Displacement Plot a. b. c. Strain Plot d. Maximum Displacement as a Function of Element Size (Perform the Simulation for Element Sizes 1, .5, .25 inch e. Plot the graph for displacement vs element size f. Reaction forces
The specific numerical values and plots will depend on the exact geometry, material properties, and boundary conditions used in the simulation.
A general explanation of the analysis and the expected results for a simply supported beam loaded with a concentrated force.
Simulation Description:
a. SolidWorks Model: A 2"x1"×10" solid beam model is created in SolidWorks.
b. Analysis: A linear static analysis is performed to determine the maximum displacement and stress in the beam.
Analysis Type: Linear static analysis considers the beam's response under static loads without considering any dynamic effects or material nonlinearity.
Units: The system of units used can be either the SI (e.g., meters, Newtons) or the US customary (e.g., inches, pounds-force).
c. Materials: The beam is made of ASTM A36 steel, which has specific material properties such as Young's modulus and yield strength.
d. Boundary Conditions: The beam is fixed (fully restrained) at both ends to simulate a rigid support.
e. External Loading: A concentrated load of 2,000 pounds-force is applied at the top center of the beam.
f. Mesh: Solid elements are used for meshing the beam model, with a medium mesh density (default settings).
Element Size: The specific element size is not mentioned.
Number of Elements and Nodes: The mesh will depend on the element size and geometry of the beam model.
Results:
a. Von Mises Stress Plot: This plot displays the distribution of von Mises stress throughout the beam. The maximum stress indicates the critical region.
b. Displacement Plot: This plot shows the displacement profile of the beam. The maximum displacement indicates the most deformed region.
c. Strain Plot: This plot illustrates the strain distribution within the beam.
d. Maximum Displacement as a Function of Element Size: The simulation is performed for different element sizes (e.g., 1 inch, 0.5 inch, 0.25 inch) to analyze the effect of mesh density on the displacement results.
e. Displacement vs. Element Size Graph: A graph is plotted to visualize the relationship between the maximum displacement and the element size.
f. Reaction Forces: Since the beam is fixed at both ends, there will be reaction forces at those locations. The magnitude and direction of the reaction forces can be determined from the analysis.
Keep in mind that the specific numerical values and plots will depend on the exact geometry, material properties, and boundary conditions used in the simulation.
It is recommended to use appropriate engineering software to perform the analysis and obtain accurate results for the given beam configuration.
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Develop the general solution of the series RLC circuit with power
source.
AC voltage (state variables Vc , iL ), assign values to the
components and plot waveforms
An RLC circuit refers to a resistor, an inductor, and a capacitor linked together in series with an alternating current source. This circuit serves as a low-pass filter for the AC signals. A voltage applied to an RLC circuit leads to the creation of current, leading to a phase shift among the voltage and current.
The general solution of the series RLC circuit with a power source can be derived using the following differential equations for voltage across the capacitor and current through the inductor respectively: iL = C dvC/dt and L diL/dt + R iL= Vsin(ωt)
In the above equations, Vsin(ωt) is the AC voltage of the power source, R is the resistance, L is the inductance, C is the capacitance, t is the time, and ω is the angular frequency.
The solutions of the above equations for state variables Vc and iL can be expressed as follows:
Vc = A sin(ωt + φ)
Vc = (V/R) + Aωcos(ωt + φ),
where A and φ are constants and are determined using the initial conditions and component values assigned to R, L, and C.
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The
first question in details please
1. Derive the equation of motion for a system of particles. 2. Explain the difference between Lagrange and Hamilton equations.
Hamilton's principle states that the true path of a system in phase space is the one that extremizes the integral of the difference between the kinetic and potential energies of the system.
The Hamilton equations express the equations of motion in terms of generalized coordinates and their conjugate momenta. These equations are first-order ordinary differential equations and provide a different perspective on the dynamics of the system. Hamiltonian mechanics has advantages in dealing with systems with symmetries and in quantizing classical systems.In summary, the main difference between Lagrange and Hamilton equations lies in the formulation and mathematical structure of the equations of motion. Lagrange equations are based on the principle of least action and use generalized coordinates, while Hamilton equations are based on Hamilton's principle and use generalized coordinates and conjugate momenta.
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Question 2 of 10 View Policies Show Attempt History Current Attempt in Progress Your answer is partially correct. An unstrained horizontal spring has a length of 0.33 m and a spring constant of 180 N/m. Two small charged objects are attached to this spring, one at each end. The charges on the objects have equal magnitudes. Because of these charges, the spring stretches by 0.021 m relative to its unstrained length. Determine (a) the possible algebraic signs and (b) the magnitude of the charges. (a) Either both charges are positive or both charges are negative. Of (b) Number eTextbook and Media Hint 1.386e8 GO Tutorial Units C 0.1/1 Save for Later Using multiple attempts will impact your score. 5% score reduction after attempt 3 Attempts: 1 of 5 used Submit Answer
(a) Both charges can be either positive or negative. (b) The magnitude of the charges is 4.34 x 10^-6 C.
Given,
The length of an unstrained horizontal spring, L = 0.33 m
Spring constant, k = 180 N/m
The stretch in the spring, x = 0.021 m The magnitude of the charges on the objects is q. When the spring is stretched, the electric force, Fe on each object is:
Fe = kx
The electric force is given by:
Fe = (1/4πε) * (q²/L²) where ε is the permittivity of free space.
On comparing the above two equations we get:
kx = (1/4πε) * (q²/L²)
Therefore, q = sqrt(kL²x/(4πε))
Substituting the given values in the above equation, we get:
q = sqrt(180 * (0.33)² * 0.021 / (4π * 8.854 x 10^-12))
q = 4.34 x 10^-6 C
As the spring stretches due to charges on objects, the charges on the objects must be of the same sign, either both positive or negative.
Hence, option (a) is correct and the answer is (a) Both charges can be either positive or negative. The magnitude of the charges is 4.34 x 10^-6 C.
Hence, option (b) is correct and the answer is (b) 4.34 x 10^-6 C.
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