Answer:
Sulfur (Has six valence electrons). It has maximum valency due to belonging to VI groups of the Periodic Table.
Explanation:
The electrons found in an element's outermost atomic shell are known as valence electrons.
Sulfur, which has an atomic number of 16, has an electrical configuration of 2, 8, 6, meaning it has six electrons in its outermost shell. As a result, its valence electrons will also be six.
However, in its natural condition, sulfur exists as the S8 molecule, which has the classic chair structure where each sulfur atom is covalently connected to two other sulfur atoms. In that sense, there will be 8 valence electrons.
Consequently, the answer will be 6 if you're asking about the "sulphur atom," but 8 if you're talking about sulfur in general.
Thank you ,
Eddie
A 2.0-kg projectile is fired with initial velocity components v0x = 30 m/s and v0y = 40 m/s from a point on the Earth's surface. Neglect any effects due to air resistance.
a) What is the kinetic energy of the projectile when it reaches the highest point in its trajectory?
b) How much work was done in firing the projectile?
(a) The kinetic energy of the projectile when it reaches the highest point in its trajectory is 900 J.
(b) The work done in firing the projectile is 2,500 J.
Kinetic energy of the projectile at maximum height
The kinetic energy of the projectile when it reaches the highest point in its trajectory is calculated as follows;
K.E = ¹/₂mv₀ₓ²
where;
m is mass of the projectilev₀ₓ is the initial horizontal component of the velocity at maximum heightNote: At maximum height the final vertical velocity is zero and the final horizontal velocity is equal to the initial horizontal velocity.
K.E = (0.5)(2)(30²)
K.E = 900 J
Work done in firing the projectileBased on the principle of conservation of energy, the work done in firing the projectile is equal to the initial kinetic energy of the projectile.
W = K.E(i) = ¹/₂mv²
where;
v is the resultant velocityv = √(30² + 40²)
v = 50 m/s
W = (0.5)(2)(50²)
W = 2,500 J
Thus, the kinetic energy of the projectile when it reaches the highest point in its trajectory is 900 J.
The work done in firing the projectile is 2,500 J.
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A visitor at a Michigan lighthouse is trying to measure the height of the lighthouse. She has a big spool of string, but she doesn't have a measuring tape. She has a wrist watch with a timer function on it. She attaches a weight to the end of the string and she makes a simple pendulum. She hangs the pendulum down from the top of the spiral staircase and she measures the period of the pendulum. The period of the pendulum is 8.48 s. What is the height of the light house?
The height of the light house is 17.86m.
To find the answer, we have to know about the simple pendulum.
How to find the height of the light house?We have the expression for time period of the pendulum as,[tex]T=2\pi \sqrt{\frac{l}{g} } \\[/tex]
where, g is acceleration due to gravity, and l is the length of the pendulum.
For the pendulum with time period T kept at some height under the influence of gravity, then the height will be equal to,[tex]h=(\frac{T}{2\pi }) ^2g=(\frac{8.48}{2*3.14}) ^2*9.8=17.86m[/tex]
Thus, we can conclude that, the height of the light house is 17.86m.
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Find the orbital speed of an ice cube in the rings of Saturn. The mass of Saturn is 5.68 x 1026 kg, and use an orbital radius of 3.00 x 105 km. (G = 6.67 × 10-11 N ∙ m2/kg2)
The required orbital speed of the ice cube is 355,358m/s
What is gravitational law?The force of gravitation is directly proportional to the product of the masses and inversely proportional to the distance between them. This can be expressed mathematically as;
Fr = GMm/r²
The distance is calculated as;
s = Gm/r²
Solving both equation, we will have:
v²/r = Gm/r²
v² = Gm/r
Take the square root of both sides
v = √Gm/r
Solve the required orbital speed
V = √6.67×10^-11 * 5.68 x 10^26 / 3.00 x 10^5
V = 355358.97m/s
Hence the required orbital speed of the ice cube is 355,358m/s
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Please help, Class ends today!! will give brainiest if correct.
Fill in the blanks with agree or disagree
A list of planet-star radius ratios is an example of evidence.
I ____________ with this statement
Explain your answer, using an example from your investigation about habitable worlds.
A list of planet-star radius ratios is an example of evidence. I agree with this statement.
Why do i agree with the statement above?I agree with A list of planet-star radius ratios is an example of evidence because the Sample records that are taken for planet-star radius ratio are known to often gives a kind of an improved approximate of the stellar characteristics in regards to the smallest stars in the Kepler target list.
What does a planets radius mean?The planetary radius is known to be the distance that exist between a what we see as planet's center and its surface.
Therefore, one can say that planetary radius is known to be a measure of a given planet's size.
So, A list of planet-star radius ratios is a sample evidence and I do affirm the above statement.
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Which of the following is a force acting between objects that do not touch? Pls answer in 5-10 min!
Normal force
Frictional force
Electrical force
Applied force
Answer:
Electrical force
Explanation:
The electrons aren't actually touching each other. Normal is something on something pushed by gravity by they are touching, frictional is rubbing, applied is pushing
Stop and go traffic means a lot of opportunities for acceleration. This assignment looks at a typical experience of a car in typical
rush hour traffic. Calculate the different accelerations from the graph, interpret what your answers mean and show you really
understand acceleration.
A car traveled through rush hour traffic in a city. There was a lot of starting and stopping. The graph below shows the motion of
the car for a 16 second interval of time.
Explain why a Merry-Go-Round and a Ferris Wheel have a constant acceleration when they are moving?
You must answer using at least two complete sentences and vocabulary words from this lesson.
Q.1 Calculate the different accelerations from the graph
At initial point (let O) the velocity was 0 m/s to reach point A when the velocity was 5 m/s it took nearly 3 seconds as we all know that acceleration is nothing but the change in velocity per unit time
[tex]a \: = \frac{dv}{t} [/tex]
[tex]a = \frac{5 - 0}{3} = \frac{5}{3} \: m/ {s}^{2} [/tex]
Similarly from point A to point B the acceleration was
[tex]a = \frac{dv}{t} = \frac{7 - 5}{3} = \frac{2}{3} m/s²[/tex]
From Point B to C the velocity was constant so the acceleration at that point would be zero.
in the same way we can calculate acceleration for rest other points.
Q.2 Explain why a Merry-Go-Round and a Ferris Wheel have a constant acceleration when they are moving?
We all know that Velocity is nothing but the speed with direction. Merry Go Round and a Ferris Wheel has constant speed but dynamic direction due to which the magnitude of velocity at every point differs with different sign hence it have a constant acceleration.
When there is a imbalance in the body system and the body can’t maintain homeostasis how might other systems respond
Answer:
the stomach has too much oxygen stored inside
A ray of light incident in air strikes a rectangular glass block of refractive index 1.50, at an angle of incidence of 45°. Calculate the angle of refraction in the glass.
Answer:
Approximately [tex]28^{\circ}[/tex].
Explanation:
The refractive index of the air [tex]n_{\text{air}}[/tex] is approximately [tex]1.00[/tex].
Let [tex]n_\text{glass}[/tex] denote the refractive index of the glass block, and let [tex]\theta _{\text{glass}}[/tex] denote the angle of refraction in the glass. Let [tex]\theta_\text{air}[/tex] denote the angle at which the light enters the glass block from the air.
By Snell's Law:
[tex]n_{\text{glass}} \, \sin(\theta_{\text{glass}}) = n_{\text{air}} \, \sin(\theta_{\text{air}})[/tex].
Rearrange the Snell's Law equation to obtain:
[tex]\begin{aligned} \sin(\theta_{\text{glass}}) &= \frac{n_{\text{air}} \, \sin(\theta_{\text{air}})}{n_{\text{glass}}} \\ &= \frac{(1.00)\, (\sin(45^{\circ}))}{1.50} \\ &\approx 0.471\end{aligned}[/tex].
Hence:
[tex]\begin{aligned} \theta_{\text{glass}} &= \arcsin (0.471) \approx 28^{\circ}\end{aligned}[/tex].
In other words, the angle of refraction in the glass would be approximately [tex]28^{\circ}[/tex].
A ship is 2.40km from a large rock cliff when it sounds its foghorn at a frequency of 178Hz. How long will it take for the sounds to return to the ship? (Sound travels 343m/sec)
A ship sounds its foghorn at a frequency of 178Hz when it is 2.40km away from a sizable rock face. (Audio travels at 343 m/s.) Reconstruction succeeded in resolving the federalism controversy that had dogged the country since the 1790s.
By most other standards, reconstruction was a failure: radical Republican legislation eventually failed to shield former slaves from white persecution and to bring about significant alterations to the South's socioeconomic structure. The federalism question, which had been a topic since the 1790s practically immediately, was at hand when President Rutherford B. Former Confederate officials and slaves returned to the South after Hayes withdrew federal soldiers from the region in 1877. These newly powerful white southern legislators established anti-progressive laws like voter ID requirements and black codes with the help of a conservative Supreme Court in an effort to roll back the rights that blacks had won during Radical Reconstruction. With its rulings in the Slaughterhouse Cases, the Civil Rights Cases, and United States v., the U.S. Supreme Court strengthened this anti-progressive movement federalism.
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Lam Lesson Name: Uncovering Your Personality
m number: 700047RR
Exam Guidelines
Exam Instructions
Question 10 of 20:
Select the best answer for the question.
10. Which characteristic of a turbulent person causes them to always strive for self-improvement, and to never see accomplishing a goal as good enough?
O A. Confident
B. Self-critical
O C. Ignorant
O D. Calm
Mark for review (Will be highlighted on the review page)
ex Previous Question
Next Questin
Review My F
The correct answer is Self-critical.
Why is self-improvement?
Enhancing strengths, mental health, and even mending relationships benefit self-improvement. Simple actions like reading a book, trying something new, meditating, or even getting up early are some ways to improve oneself. There are so many easy, efficient methods to begin the process of improving oneself.A self-improvement strategy enables you to build the life you want for yourself. It enables you to maintain perspective on your priorities and the things most important to you in life to experience greater meaning and fulfillment.Self-development is taking steps to better yourself, such as by learning new skills or overcoming bad habits. An example of self-development is taking courses at the university to learn new skills and interesting things.Self-critical:
Self-critical causes them to always strive for self-improvement and never to see accomplishing a goal as good enough.
The characteristic of a turbulent person causes them to always strive for self-improvement and to never see accomplishing a goal as good enough is Self-critical.
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Quark gluon plasma (qgp) is what kind of state of matter I.e. it’s equation of state is what?
a 10 kg block reaches a point with a velocity of 15 m per second and slides down a rough track my the coefficient of the kinetic energy between the two surface ab and the block iis0.52
progress of science has not caused any ill effect true or false?
The _____ is locked into a gravitational pull with our Milky Way, so both are actually
orbiting each other and slowly closing the gap between the them.
Kepler-22
Andromeda galaxy
PSR B1620-26 b
O Proxima-b
Answer:
Andromeda galaxy is the correct answer.
What is 2 chemical properties of acids and bases
⇒ Acids taste sour, react with metals, react with carbonates, and turn blue litmus paper red. Bases taste bitter, feel slippery, do not react with carbonates and turn red litmus paper blue.
The study of acids and bases is crucial to chemistry. The Lewis acid/base motif, which broadens the concept of an acid and base beyond H+ and OH- ions, is one of the most relevant theories.
Acids are ionic compounds, which means they have a positive or negative charge. In water, these ionic compounds separate to create hydrogen ions, or H+.
The quantity of H+ ions in the solution determines how strong an acid is. Acid is stronger the more H+ there is. Bases are ionic substances that separate in water to produce the negatively charged hydroxide ion (OH-). The quantity of Hydroxide ions in a base determines its strength (OH-). The strength of the base increases with OH- ion concentration.
Hope this helps,
- Eddie.
Explain the changes that occur during upstoke and downstoke of water pump with diagram
Answer: Downstroke: When the handle of a water pump is lifted up, the piston is pushed down. It is downstroke of the piston. In this condition, the volume of part A decreases and water pressure increases in this part. The increased pressure shuts the valve ‘A’ and opens the valve ‘B’ It makes the water of part A into pass part B of the cylinder.
Upstroke: When the handle is pushed down, it lifts the piston up. It is upstroke. During upstroke, the volume of part A increases and water Downstroke Upstroke pressure at that part decreases. It makes valve A opened and valve B closed. Thus, the water from the source enters into part A of the cylinder. The water of part B is lifted up and it comes out from the spout.
Explanation:
A solid, homogeneous sphere with a mass of m0, a radius of r0 and a density of ρ0 is placed in a container of water. Initially the sphere floats and the water level is marked on the side of the container. What happens to the water level, when the original sphere is replaced with a new sphere which has different physical parameters? Notation: r means the water level rises in the container, f means falls, s means stays the same. Combination answers like 'f or s' are possible answers in some of the cases.
The new sphere has a density of ρ > ρ0 and a mass of m = m0.
The new sphere has a mass of m > m0 and a radius of r = r0.
The new sphere has a radius of r = r0 and a density of ρ > ρ0.
Based on the given data about, volume, mass, and density of the spheres;
the water level will fall; fthe water level may rise or fall; r or fthe water level will rise; rWhat determines whether an object floats are sinks in water?The density, mass, volume, and shape of an object determines whether it will float or sink in water.
Density = mass/volumeFor an object to float, it will displace its own weight of the fluid in which it floats. This is according to Archimedes' principle which states that the upward force acting on a body immersed fully or partially in a fluid, is equal to the weight of the fluid displaced.
Considering the given scenarios:
1. The new sphere has a density of ρ > ρ0 and a mass of m = m0.
This means that the volume of new sphere is smaller than the volume of the original sphere, therefore, the water level will fall,
2. The new sphere has a mass of m > m0 and a radius of r = r0.
This means that the new sphere will have a greater volume and mass. However, the density may be greater or less.. Therefore, the water level may rise or fall.
3. The new sphere has a radius of r = r0 and a density of ρ > ρ0.
The new sphere has equal volume, greater density and mass than the original sphere. Therefore, the water level will rise.
In conclusion, the level of the water in the container depends on the volume, mass and density of the object placed in it.
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what is buoyant force
Answer:
When an object is immersed in water. it is pulled downwards due to gravitational pull of earth. Water exerts upward force on the object. This makes object rise up. This upward force is called buoyancy or upthrust.
A phone with a mass of 0.2 kg is dropped from a height of 30 m what is it’s speed when it hits the ground?the acceleration of gravity is 9.8ms
Answer:
24.2 m/s
Explanation:
Mass is irrelevant in this situation....
Displacement: ( to find time)
x = xo + vo t - 1/2 at^2
30= 0 + 0 - 1/2 (9.8)t^2
t = 2.47 seconds
Velocity:
vf = a t = 9.8 (2.473) = 24.2 m/s
Piston 1 in the figure has a diameter of 1.87 cm.
Piston 2 has a diameter of 9.46 cm. In the absence of friction, determine the force F, necessary to support an object with a mass of 991 kg placed on piston 2. (Neglect the height difference between the bottom of the two pistons, and assume that the pistons are massless).
The force F, necessary to support an object with a mass of 991 kg placed on piston 2 is 379.5 N.
Force necessary to support the objectApply Pascal principle to calculated the force needed to support the mass as shown below;
F₁/A₁ = F₂/A₂
F₁/d₁² = F₂/d₂²
F₁ = F₂d₁²/d₂²
where;
F₂ is the force on piston 2, determined from, F = mgd₂ is the diameter of piston 2, given as 9.46 cmd₁ is diameter of piston 1, given as 1.87 cmF₁ is force on piston 1 = ?Substitute the given parameters and solve for the force needed to support the mass given.
F₁ = (991 x 9.8 x 0.0187²)/(0.0946)²
F₁ = 379.5 N
Thus, the force F, necessary to support an object with a mass of 991 kg placed on piston 2 is 379.5 N.
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Liquids are used in thermometer but not the solid.
Solids have very small intermolecular space and when heated, do not expand as per the container volume. Basically, their expansion is not good.
Liquids, on the other hand, have a definite volume and their expansion is ideal. Also, they fill the container only to the desired level, unlike gases.
*please refer to photo*
Use meters and seconds for all calculations. Show the appropriate units for measured and calculated values
Based on the calculations, the average velocity is equal to 360 m/s and the percent difference is equal to 4.72%.
What is average velocity?An average velocity can be defined as the total distance covered by a physical object divided by the total time taken.
What is an average?An average is also referred to as mean and it can be defined as a ratio of the sum of the total number in a data set to the frequency of the data set.
How to calculate the average velocity?Mathematically, the average velocity for this data set would be calculated by using this formula:
Average = [F(v)]/n
Vavg = [v₁ + v₂ + v₃ + v₄ + v₅)/5
Since the values of the average velocity from the table are missing, we would assume the following values for the purpose of an explanation:
v₁ = 100 m/sv₂ = 150 m/sv₃ = 200 m/sv₄ = 250 m/sv₅ = 300 m/sSubstituting the parameters into the formula, we have:
Vavg = [300 + 450 + 500 + 250 + 300)/5
Vavg = 1800/5
Vavg = 360 m/s.
Next, we would calculate the percent difference by using this formula:
[tex]Percent \;difference = \frac{[V_{avg}\;-\;V_{sound}]}{V_{sound}} \times 100[/tex]
Percent difference = [360 - 343]/360 × 100
Percent difference = 17/360 × 100
Percent difference = 0.0472 × 100
Percent difference = 4.72%.
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How much heat is required to raise the temperature of 0.210 g of water from 19.2 ∘C to 32.0 ∘C?
Data:
m = 0.210 g T₀ = 19.2 °C + 273 = 292. 2 KT = 32.0 °C + 273 = 305 KCe = 4.18 J / GKWe apply the following formula
Q = mcₑΔT
Q = mcₑ (T - T₀)
We substitute Our data in the formula and solve:
Q = 0.210 g * 4.18 J / g K (305 k - 292.2 k)
Q = 11.23 J
ox A has a mass of 20.0kg and Box B has a mass of 30.0kg. Box A is placed on a horizontal surface that is frictionless and Box B is hanging from a pulley by a rope connected to Box A. If the acceleration of the system is 5.88m/s2, what is the Tension T on Box A?
The tension on box A is 117.6 N
What is Equilibrium of Forces ?Equilibrium is a state of an object with respect to a given observable quantity during the time for which there is no change in that quantity.
A body is said to be in equilibrium when:
the body as a whole either remains at rest or moves in a straight line with constant speed.the body is either not rotating at all or is rotating at a constant angular velocity.Given that box A has a mass of 20.0kg and Box B has a mass of 30.0kg. Box A is placed on a horizontal surface that is frictionless and Box B is hanging from a pulley by a rope connected to Box A.
The tension in the rope will be the same.
Given that Box A is placed on a horizontal surface that is frictionless, that is,
T = ma .... (1)
Also, Box B is hanging from a pulley by a rope connected to Box A. That is,
W - T = ma ...... (2)
Where W = mg
Since the acceleration of the system is 5.88m/s² which will be the same for the two equations, then the Tension T on Box A can be calculated by substituting acceleration and mass into equation (1)
T = 20 x 5.88
T = 117.6 N
Therefore, the tension on box A is 117.6 N
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How far would you push a car if you did 28,000J of work, exerting a force of 825N?
We push a car to the distance of 33.939m if we do 28000J work , exerting a force of 825N.
What is work done and force ?work done: The amount of energy transferred to a body .Force : force is an influence that can change the velocity of an object .How to calculate distance moved from work done and force ?we know ; work done =Force ×distance moved in the direction of force Mathematically, W=F.Swhere W= work doneF = applied force
S = distance moved
So S=W/F=28000J/825N
=33.939meter
Thus, we can conclude that the distance moved by the car is 33.939m.
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What is an example of total internal reflection at work?
A.
A ray of light has the same intensity both entering and exiting a fiber optic cable.
B.
A ray of light entering a glass cube gets refracted.
C.
A ray of light in air hits a shiny surface and bounces off.
D.
A ray of light entering a ruby gets refracted.
[tex]\huge\underline{\underline{\boxed{{ \mathbb{SOLUTION:}}}}}[/tex]
[tex]\leadsto[/tex] Total internal reflection occurs when a ray of light is traveling through a medium and, when that medium changes, it does not refract into the second medium but instead it reflects back into the first medium.
By Snell's law, we know that
[tex]\longrightarrow \sf{n_1 sin \emptyset_1 = n_2 sin \emptyset_2}[/tex]
If this happens, then [tex]\sf{n_2 \angle n_1}[/tex], and the ray does not lose intensity due to refraction.
[tex]\huge\underline{\underline{\boxed{\mathbb{ANSWER:}}}}[/tex]
[tex]\large \bm{ A.}[/tex] A ray of light has the same intensity both entering and exiting a fiber optic cable.
Have my equation written out but struggling to solve. Can someone help me solve!
The solution of this system is (i₁, i₂, i₃) = (- 10.852 A, 8.479 A, - 2.374 A). The negative signs indicate that real direction of the current is opposite than supposed.
How to find the missing current in a circuit
In this question we must make use of Kirchhoff's laws to find the values of the missing currents in the circuit presented in the picture. There are two rules according to Kirchhoff's laws:
The sum of currents found at nodes of circuits is always equal to zero.The net sum of voltages in a closed loop of a circuit is always equal to zero.Based on the information given by the picture, we have the following system of linear equations that describes the entire circuit:
i₃ = i₁ + i₂
- i₁ · R₁ + ε₁ - i₁ · r₁ - i₁ · R₅ + ε₂ - i₂ · (r₂ + R₂) = 0
ε₂ - i₂ · (r₂ + R₂) - i₃ · r₄ - ε₄ - i₃ · r₃ + ε₃ - i₃ · R₃ = 0
- i₁ - i₂ + i₃ = 0 (1)
(R₁ + r₁ + R₅) · i₁ + (r₂ + R₂) · i₂ = ε₁ + ε₂ (2)
(r₂ + R₂) · i₂ + (r₄ + r₃ + R₃) · i₃ = ε₂ + ε₃ - ε₄ (3)
If we know that R₁ = 5 Ω, r₁ = 0.10 Ω, R₅ = 20 Ω, r₂ = 0.50 Ω, R₂ = 40 Ω, r₄ = 0.20 Ω, r₃ = 0.05 Ω, R₃ = 78 Ω, ε₁ = 22 V, ε₂ = 49 V, ε₃ = 10.5 V and ε₄ = 33 V, then the currents flowing in the circuit are:
- i₁ - i₂ + i₃ = 0
25.1 · i₁ + 40.5 · i₂ = 71
25.1 · i₂ + 78.25 · i₃ = 26.5
The solution of this system is (i₁, i₂, i₃) = (- 10.852 A, 8.479 A, - 2.374 A). The negative signs indicate that real direction of the current is opposite than supposed.
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Which one of the following is a source of mechanical form of energy? A. Coal B.Wind C.Battery D.Magnet
wind (b), also some others are:
- steam
- gas
- liquid fules
PLEASE HELP!!!!
1. What is 'red shift'?
2. What is 'blue shift'?
3. What is the dopple shift/effect?
4. What is the difference between the blue shift and the red shift?
Hi There. So the 'red shift' and the 'blue shift' are all apart of the Doppler shift. But they are polar opposites.
Question 1:
Red shift means the frequency and associated wavelength of visible light has shifted toward the red part of the spectrum of EM radiation, as opposed to blue shift which means the frequency and associated wavelength has shifted toward the blue part of the spectrum. Red shift is a lower frequency / longer wavelength, and blue shift is a higher frequency / shorter wavelength. You could be wondering what causes red shift, and there are a few reasons for it. One of the causes is relativistic motion, often known as the Doppler Effect, which was initially noticed with sound waves and moving observers and sources. The light looks redder as a source moves away from an observer (they move away from each other, regardless of which one is traveling with respect to some reference frame), and bluer as the two move closer to one another. The term gravitational red shift refers to another reason. As a photon (a quantum of EMR) moves away from the surface of a mass aggregation, such as a star, the intensity of the field's magnitude decreases by the square of the distance, and the photon accelerates. A photon experiences the reverse consequence as it passes through a g-field with a rising magnitude of pressure, but there is considerable disagreement over what happens to the little amount of kinetic energy obtained from the field. Gravitational red shift is then seen. EM in nature is another factor. The phosphor coating on the interior of the glass tube is struck by UV radiation that is emitted by the arc carried via the mercury vapor in fluorescent lamps. The UV photons' energy is absorbed by the phosphor coating, which subsequently emits heat and visible light. The transition from UV to visible light and heat is a classic red shift. The identical red shift phenomena is explained by three separate methods.
Question 2:
The displacement of the spectrum to shorter wavelengths in the light coming from distant celestial objects moving toward the observer. Ever notice the sound of a car or train is higher pitched when it's heading toward you, and becomes lower as it goes away? Light does the same thing. If you look at an object that's heading away from you quickly enough, it will appear more red than it actually is. If something is heading towards you, it will appear more blue. This becomes very useful for astronomers; if you know a certain object's composition, you can tell how fast it's moving by the color change.
Question 3:
The apparent difference between the frequency at which sound or light waves leave a source and that at which they reach an observer is known as the "Doppler effect," and it is caused by the relative velocity of the wave source and the observer. This phenomena is used in astronomical observations, Mössbauer effect studies, radar, and modern navigation. The earliest description of it was published in 1842 by Austrian scientist Christian Doppler. The apparent pitch of a blowing horn is a fantastic illustration of the Doppler effect since it increases as you move closer to it before decreasing as you pass it. Similar to this, when a star is observed from Earth, its light shifts toward the violet end of the spectrum (higher frequency or shorter wavelength) when the star and Earth are getting closer and toward the red end of the spectrum (lower frequency or longer wavelength) when the star and Earth are getting farther apart. The Doppler effect is often used in contemporary models of the cosmos to study stellar motion and search for double stars. see redshift as well.
Question 4:
Blueshift is the name for an object's light while it is travelling toward us, and redshift is the name for an object's light when it is going away from us.
Thank you,
Eddie
A dog running to the right at 4 m/s sees a ball and accelerates steadily to catch it. The dog accelerates to the right at a rate of 0.21 m/s^2 and catches the ball after 3.8s. What was the dogs velocity when it caught the ball? *Assume here that running to the right is positive and running to the left is negative.
A- 7.96
B- 10.569
C- 6.782
D- 4.798
E- none
Answer:
D.-4.798m/s
Explanation:
Greetings !
Given values
[tex]u= 4ms \\ a = 0.21ms {}^{2} \\ t = 3.8sec[/tex]
Solve for V of the given expression
Firstly, recall the velocity-time equation
[tex]v = u + at[/tex]
plug in known values to the equation
[tex]v = (4) + (0.21)(3.8)[/tex]
solve for final velocity
[tex]v = 4.792ms[/tex]
Hope it helps!
An electron is ejected from the cathode by a photon with an energy slightly greater than the work function of the cathode. How will the final kinetic energy of the electron upon reaching the anode compare to its initial potential energy immediately after it has been ejected?.
The kinetic energy of the ejected electron (photoelectron) is equal to the energy of the photon minus the work function (E required to eject the photoelectron).
The process of final kinetic energy of the electron upon reaching the anode compare to its initial potential energy immediately after it has been ejected -
The electron has a lot of potential energy and very little kinetic energy when it is liberated from the cathode (as it is not moving yet or moving very slowly). We are currently on the left side of the picture above. The electron accelerates and speeds up as it goes away from the cathode and toward the anode. As a result, the kinetic energy rises.The electron is likely to have the highest kinetic energy and the lowest potential energy when it reaches the anode.Therefore, the kinetic energy at the end of the electron's journey is approximately equal as the potential energy at the beginning (when the electron was released).Learn more about kinetic energy
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