Radio frequency (RF) is a unit of measurement used to describe the rate of oscillation of electromagnetic radiation spectrum, or electromagnetic radio waves, with frequencies as high as 300 gigahertz (GHz) and as low as 9 kilohertz (kHz).
What is RF in radio?The electromagnetic "spectrum" refers to all electromagnetic radiation in its collective form. Electromagnetic energy includes, for example, the radio waves and microwaves that transmitting antennas emit. "Radiofrequency" or "RF" energy or radiation is the term used to refer to all of them.The most often used frequencies are those that range from 500 MHz to 3 GHz because they provide a balanced set of benefits in terms of transmission range, capacity to handle large data rates, and antennae size. Most radar systems employ the X bands (8–12 GHz).Furthermore, you must have your radio receiver tuned to a specific frequency in order to pick up the information carried by these waves. It so happens that 2.4 GHz and 5 GHz are the WiFi frequencies. Your microwave's frequency and these waves are extremely comparable.To Learn more About Radio frequency refer To:
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what is the total work wfric done on the block by the force of friction as the block moves a distance 7.00 m up the incline?
The total work done on the block by the force of friction is 14 J.
What is what done by friction force?The work done by a force of friction is obtained from the product of the force of friction and the displacement of the object.
Mathematically, the work done by force of friction is given as;
W = Fd
where;
F is the force of frictiond is the displacement of the objectThe given parameters include;
force of friction = 2 Ndisplacement of the block = 7 mThe total work done on the block by the force of friction is calculated as;
W = 2 N x 7 m
W = 14 J
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The complete question is below:
what is the total work wfric done on the block by the force of friction of 2 N as the block moves a distance 7.00 m up the incline?
Consider Couette flow between two parallel plates separated by a distance H. The lower plate moves with velocity us1
and the upper plates move in the opposite direction with velocity us2.The channel is filled with an ideal gas. Assume velocity slip conditions, determine the mass flow rate. Under what condition will the net flow rate be zero?
The mass flow rate can be given as [tex]V=S[\frac{u_y}{2}-\frac{H^3}{12m}\frac{\delta p}{\delta x}][/tex] and when H=0 then net flow rate will be zero.
Given,
upper plate velocity = [tex]u_{s1}[/tex]
opposite plate velocity = [tex]u_{s2}[/tex]
The total velocity between the plates will be
[tex]u_y=u_{s1}+u_{s2}[/tex]
Flow rate is the velocity integrated over an area,
[tex]Q=\int \overline u \hat n \ dA[/tex]
The equation above is only valid for a flat, plane area. In general, including curved areas, the equation becomes a surface integral.
The areas would be cross-sectional.The area of a liquid passing through a pipe is the cross-section of the pipe at the section under consideration. The magnitude of the area through which the mass passes, A, and a unit vector normal to the area combine to form the vector area.
The mass flow rate ,
[tex]V=SQ=S\int\limits^H_0 \int\limits^L_0 u(y)dzdy\\\\=SL\int\limits^H_0u(y)dy\\\\\frac{V}{L}=S\int\limits^H_0[\frac{1}{2m}\frac{\delta p}{\delta x}(y^2-Hy)+\frac{u_y}{H}]dy\\\\=\frac{S}{2M}\frac{\delta p}{\delta x}(\frac{H^3}{3}-\frac{H^3}{2})+\frac{u_y}{2}[/tex]
The mass flow rate for unit width is
[tex]V=S[\frac{u_y}{2}-\frac{H^3}{12m}\frac{\delta p}{\delta x}][/tex]
if H=0 then net flow rate will be zero.
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Most of the energy you expend in cycling is dissipated by the drag force. If you double your speed, you increase the drag force by a factor of 4. This increases the power to cycle at this greater speed by what factor?
A. 2 B. 4 C. 8 D. 16
The power is increased by factor of 8 beacuse of the energy consumed in increasing the drag force.
Power is the rate of energy release. CCCs have high energy, but the TNT explosion has high power. It is defined as the energy used per second. It is the rate of energy release,
power = energy/time
The most common unit for power is the watt, named after James Watt who truly developed the science of the steam engine. It was the most powerful motor of its time, and the “high tech” of the 1700s. The watt is defined as one joule per second:
1 Watt = 1 W = 1 watt = 1 joule per second
1 kW = 1 kilowatt = 1000 joules per second
The value of TNT is that even though it has less energy per gram than chocolate chip cookies, it has greater power (since it can convert its limited energy to heat in a few millionths of a b). Of course, it can’t deliver this power for very long because it runs out of energy.
Power (P) = F v
Given,
where n is new
Vn = 2v
And Fn = 4F
So Pn = Fn*Vn
= 4F *2v =
= 8 (Fv) = 8 P
So, this increases the power by factor of 8.
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What kind of energy does the skier have at the top of the slope?
Potential energy is the energy that the skier have at the top of the slope as there will be a equillibrium which means zero velocity and maximum height.
The skier has potential energy at the top of the slope, which he will primarily transform into kinetic energy as he descends the hill. His body and the air, as well as his skis and the snow, will cause some of his PE to be transformed into thermal energy.
The ski lift, which elevated him against gravity, gave him his PE. In an electric motor, the lift transformed electrical energy into kinetic energy. A little portion of this energy was also converted to heat energy by friction in all of the moving elements.
The first law of thermodynamics is exemplified by the energy transformations. Examples of the second law include the losses caused by thermal energy diffusion.
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Nancy is running around a circular track encircling the reservoir where she grew up in Boston. As she's running, which of the following is true?
A. Her shoes need to exert a small, radially inward force on the ground to keep her body moving along the circular track.
B. Her shoes need to exert a small, radially outward force on the ground to keep her body moving along the circular track.
C. Her shoes do not need to exert any force in the radial direction to keep her moving around the circle.
Option B; Her shoes need to exert a small, radially outward force on the ground to keep her body moving along the circular track.
A body can change its state of rest or motion when an external force acts on it. It is directed and has a magnitude. Force is applied at a location known as the application, and the direction in which it is applied is referred to as the force's direction. Force is the pushing or pulling of an object. When objects interact with one another, push and pull are generated. You can also describe force using words like stretch and squeeze.
A mass-containing object's velocity changes when a push or pull is applied, according to the definition of force in physics.
Motion in physics is characterised as a shift in position with respect to time. Motion is just the movement of something, as opposed to
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calculate the total impedance of the circuits in fig. 123. express your answer in rectangular and polar forms
a)6.8 + j8.2 ohms=10.65(50.33 deg) ohms
b)12-j6 ohms=13.41(-26.57 deg) ohms
c)6.6+j10 kohms=11.98(56.575 deg) ohms
RECTANGULAR FORMS
a) 6.8+j8.2 ohm
b)12-j6 ohm
c) 6.6+j10 kohm
POLAR FORMS
a) 10.65 angle 50.332 deg
b) 13.416 angle -26.565 deg
c) 11.982 angle 56.575 deg
Impedance, sometimes referred to as a "AC circuit," is the resistance to electricity passing through a circuit that uses an alternating current. Impedance, which is measured in Ohms, is the result of the combined action of the circuit's current-limiting elements, such as Resistance (R), Inductance (L), and Capacitance (C) (C).
The resistance to current flow in a Direct Current (DC) circuit is known as impedance, but in an AC circuit, impedance is the consequence of both the resistive (R) and reactive (X) components of the circuit. A DC circuit's electrical resistance is indicated by the letter "R," but an alternating AC circuit's resistance to current flow is indicated by the letter or symbol "Z."
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With the tank at least partially filled so there is some water above the pressure gauge, change fluid density to gasoline: 700kg/m². Record pressure gauge reading ______kPa. Change fluid density to close to honey: 1400kg/m². Record pressure gauge reading ______kPa. Does the pressure double when the density of the liquid doubles? _____Why/why not?
Honey and gasoline have different densities, so the pressure does not double when a liquid's density does.
What is meant by liquid density?A liquid's density serves as a gauge for its weight relative to the volume being evaluated. The liquid that weighs more is denser if two distinct liquids are weighed in quantities that are equivalent. It will float on the water if a liquid that is less thick than water is carefully added to the surface of the water.
Due to the various densities of honey and gasoline, the pressure does not double when the density of a liquid does. Since we all know that the acceleration caused by gravity is constant, I made the assumption that the liquid level would remain the same throughout the activity.
Only the variation in density caused by the chemical composition of the substance has an impact on pressure. According to Pascal's Law, the only situation in which a liquid's pressure could possibly double is if the two objects were the same liquid but were at different heights.
Change fluid density to gasoline at a density of 700 kg/m2, with the tank at least partially filled such that there is some water above the pressure gauge. Note the 118.2 kPa pressure measurement on the gauge. Adjust fluid density to 1400 kg/m2, which is similar to honey. Keep track of the pressure reading, 135.2 kPa. Does the pressure double as the liquid's density does? No why or why not
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Chapter 9 Chapter Review
297
6. The starting line of a cross country foot race is at the
bottom of a hill. Which form(s) of mechanical energy of
the runners will change when the starting gun is fired?
Kinetic energy only
a.
b.
Potential energy only
1
c.
Both kinetic and potential energy
d. Neither kinetic nor potential energy
02 Simple Machines
Answer:
c. Both kinetic and potential energy
Explanation:
When the starting gun is fired at the beginning of a cross country foot race, the runners will begin to move from a stationary position at the bottom of a hill. This movement will result in a change in both their kinetic energy and potential energy.
Kinetic energy is the energy of motion, and it will increase as the runners accelerate from a stationary position and begin moving at a faster speed.
Potential energy is energy stored in an object due to its position or shape. The runners at the starting line have potential energy due to their position at the bottom of a hill. As they begin to move upward, their potential energy will decrease as they move further away from the ground.
Therefore, both kinetic and potential energy will change when the starting gun is fired at the beginning of a cross country foot race.
what is - zqxs toivde :: apple flavoured and 8 are blackberry flavoured. She chooses a sweet at random and eats it. Then she chooses another sweet at random. Calculate the probability
The probabilities regarding the sweets are given as follows:
a) both sweets were apple flavour: 5/17.
b) both sweets were blackberry flavored: 28/153.
c) the first was apple and the second was blackberry: 40/153.
How to calculate the probabilities?A probability is calculated as the division of the number of desired outcomes by the number of total outcomes.
The sweets are chosen without replacement, hence the probability that both sweets were of apple flavor is calculated as follows:
p = 10/18 x 9/17 = 5/17.
The probability that both were blackberry flavored is calculated as follows:
p = 8/18 x 7/17 = 28/153.
The probability that the first was apple and the second was blackberry is of:
p = 10/18 x 8/17 = 40/153.
Missing InformationThe complete problem is given as follows:
Maria has a bag containing 18 fruit drop sweets. 10 are apple flavoured and 8 are blackberry flavoured. She chooses a sweet at random and eats it. Then she chooses another sweet at random. Calculate the probability that:
a) both sweets were apple flavour
b) both sweets were blackberry flavored
c) the first was apple and the second was blackberry
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Wind gusts create ripples on the ocean that have a wavelength of 5.00 cm and propagate at 2.00 m/s. What is their frequency?
The frequency of the wave of the wind gusts is determined as 40 Hz.
What is frequency of a wave?The frequency of a wave is the number of waves that pass a fixed point in a given amount of time. In other words, is the number of cycles completed by a wave in a given time period.
Mathematically, the relationship between frequency, velocity and wavelength of a wave is given as;
v = fλ
f = v / λ
where;
f is the frequency of the wavev is the velocity of the waveλ is the wavelengthf = (2 m/s) / (0.05 m)
f = 40 Hz
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How did John philoponus changed the science of forces
Answer:
philoponus originated one of physics great paradigm shifts. he said that after a projectile is launched, it keeps moving because of a force impressed into it by the thrower
part iii: generalized atmospheric circulation below is a very simplified version of the earth with no continents, just oceans. it still receives more solar radiation at the equator than at the poles.
The large-scale flow of air known as atmospheric circulation, together with ocean circulation, is how thermal energy is dispersed throughout the Earth's surface.
Although the large-scale structure of the Earth's atmospheric circulation varies from year to year, it is generally consistent. Mid-latitude depressions and tropical convective cells are smaller scale weather phenomena that develop chaotically. Long-range weather predictions for these systems cannot be made beyond ten days in practice or a month in principle (see chaos theory and the butterfly effect).The weather on Earth is a result of both the laws of thermodynamics and the Sun's lighting of the planet. The atmospheric circulation can be thought of as a heat engine powered by the Sun, whose ultimate energy sink is the Earth.To know more about atmospheric circulation
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What Happens After Water Vapor Condenses?
Answer:
after water vapor condenses it is cooled down enough to turn back into a liquid and forms clouds in the air
A long straight wire carrying current I is moving with speed v toward a small circular coil of radius r containing N turns, which is attached to a voltmeter as shown. The long wire is in the plane of the coil. (Only a small portion of the wire is shown in the diagram.) The radius of the coil is 0.02 m, and the coil has 11 turns. At a particular instant I = 3 amperes, v = 3.3 meters per second, and the distance from the wire to the center of the coil x = 0.17 m. (a) What is the magnitude of the rate of change of the magnetic field inside the coil? You will need to calculate this algebraically before you can get a number. Write an expression for the magnetic field due to the wire at the location of the coil. Use the approximate formula, since the wire is very long. Remember the chain rule, and remember that v = dx/dt. dB/dt = T/S (b) What is the magnitude of the voltmeter reading? Remember that this includes all 11 turns of the coil. volts
The magnitude of the rate of change of the magnetic field inside the coil 9.57*10^-5 T /s, voltmeter reading is 1.386*10^-6 V
Given that radius of the coil is r = 0.02m
Number of turns in the coil is N = 11
current in the coil is I = 3.0A
velocity is v = 3.3 m/s
distance from the wire to the center of the coil is x = 0.17m
db. / dt. = B. v / x
B = 2(μ_0 N i / )3πx
= 2 * 4π*10^-7 * 11 * 3.0A / 4π*0.17m
= 5.12*10^-6 T
dB / dt = 5.12*10^-6 * 3.3m/s / 0.17 m
= 9.57*10^-5 T /s
b ) voltmeter reading is V = n A dB / dt
= 11*π ( 0.02)^2 * 9.57*10^-5 T/s
= 1.386*10^-6 V
An electro magnetic field, often known as an EM field or EMF, is a non-quantum (classical) field created by accelerating electric charges. [1] The classical equivalent of the quantum electrodynamics' quantized electromagnetic field tensor, it is the field that classical electrodynamics describes. Charges and currents are affected by the electromagnetic field, which interacts with them and moves at the speed of light (in fact, this field can be compared to light). One of the four basic forces of nature is its quantum counterpart (the others are gravitation, weak interaction and strong interaction.)
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question a company determines the mean and standard deviation of the number of sick days taken by its employees in one year. which of the following is the best description of the standard deviation?
A company determines the mean and standard deviation of approximately the mean distance between the number of sick days taken and the mean number of sick days taken by all employees.
What is standard deviation?
The term "standard deviation" (or "") refers to a measurement of the data's dispersion from the mean. A low standard deviation implies that the data are grouped around the mean, whereas a large standard deviation shows that the data are more dispersed.
Think about the following data: 2, 1, 3, 2, 4. The average and the total square of the observations' departures from the mean will be 2.4 and 5.2, respectively. This means that (5.2/5) = 1.01 will be the standard deviation.
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A car moving at 18 m/s crashes into a tree and stops in 1.14 s. The mass of the passenger inside is 69 kg.Calculate the magnitude of the average force, in newtons, that the seat belt exerts on the passenger in the car to bring him to a halt.
The force the seat belt exerts on a passenger in the car to bring him to a halt is 0.6 × [tex]10^{3}[/tex]
A car moving at 18 m/s crashes into a tree and stops in 1.14 s. calculate the force the seat belt exerts on a passenger in the car to bring him to a halt. the mass. of the passenger. is 69. kg
Generally the equation for the net Force is mathematically given as
Fnet = mdv/dt
net = 69*10/1.14 = 0.6 × [tex]10^{3}[/tex]
When objects interact with one another, push and pull are generated. You can also describe force using words like stretch and squeeze.
Force is described as follows in physics:
A massed item changes its velocity in response to a push or pull.
Force is applied at a location known as the application, and the direction in which it is applied is referred to as the force's direction.
Using a spring balance, one can quantify the Force. Newton is the unit of force in the SI (N) The following list of consequences of the Force is not exhaustive.
A body at rest can move with enough force.
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what is the magnitude of the momentum of a 0.140 kg baseball traveling at 45.0 m/s?; impulse: in a collision between two unequal masses, which mass receives a greater magnitude impulse?; a 0.140 kg baseball traveling 35.0 m/s; a 0.140 kg baseball is dropped and reaches a speed of 1.20 m/s; two ice skaters push off against one another; a 100g ball falls from a window that is 12 m; a rubber ball and a lump of clay
Thus, the baseball's momentum is measured as 6.3kg/m/s (6.3 kg/m/s).
What is the size of the average force the ball applies to the bat?
The average force acting during the bat-ball collision is therefore about two tons, with a peak force of nearly four tons, during the 0.7 millisecond contact time. There's a lot of force there.
What is the connection between collision and momentum?
During collisions between objects, momentum is a relevant concept. The total momentum before a collision between two objects equals the total momentum after the impact (in the absence of external forces). The law of conservation of momentum is this. It holds true in every collision.
What is the system's momentum following the collision?
The total momentum of two objects does not change when they collide. The sum of the individual momenta of the objects, both before and after the collision, is the total momentum. The product of an object's mass and velocity, expressed in kilogram meters per second, determines its momentum.
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A 15.0 kg penguin waddling east at a velocity of 7.0 m/s collides with a stationary 10.0 kg penguin. After the collision the 15.0 kg penguin is traveling at a velocity of 4.2 m/s 20.0o S of E.
a. What is the velocity of the 10.0 kg penguin after collision?
b. is this collision elastic or inelastic?
The velocity of the 10.0kg stationary penguin after collision with a 15.0 kg penguin which has a velocity of 7.0m/s is 4.2m/s and the collision is inelastic.
Whether it is an elastic or nonelastic collision is the momentum of the system will remain the same, which is also known as the law of conservation of momentum
m1v1+m2v2 = m1u1+m2u2
where,
m1 = mass of the first object
m2= mass of the second object
v1= velocity of the first object before the collision
v2=velocity of the second object before the collision
u1=velocity of the first object after collision
u2=velocity of the second object after collision
So,
15×7 +10×0 = 15×4.2 +10×u2
⇒105 = 63 + 10×u2
⇒u2 = 4.2
Since in this whole process the loss of kinetic energy is happening via the form of heat, light, and sound so it is an inelastic collision
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The index of refraction of a glass plate is 1.60. What is the Brewster's angle when the plate isin the following substances?(a) air1°(b) water2
The Brewster's angle when the plate is in the air is 58° and 50° when in water for the given refractive index of the glass plate.
What is Brewster's angle?
In most cases, at least a portion of the optical power of the light is reflected when it strikes a flat boundary between two different transparent materials. However, given a specific incidence angle known as Brewster's angle.
What is Refractive Index?The refractive index of an optical material is a dimensionless quantity that indicates how well that material bends light. The refractive index controls how much light is refracted or curved when it enters a medium.
Calculations:
Brewster angle
θB = tan-1 (n2 /n1)
For air
θB= tan-1 (1.60 /1)
= 58°
For water
θB = tan-1 (1.60 / 1.33) =50.2°
Hence, Brewster's angle when the plate is in the air is 58° and 50° when in water for the given refractive index of the glass plate.
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Two long parallel copper wires carry currents of 5A each in opposite directions. If the wires are separated by a distance of 0.5m , then the force between the two wires is
A. 10â5N, attractive
B. 10â5N repulsive
C. 2Ã10â5N, attractive
D. 2Ã10â5N,repulsive
The force between the two wires is 10^-5 N repulsive. option B is the correct answer
The force is repulsive because the currents are in opposition.
From the question, we have
force (F)= μ*i1*i2/2πd
=2*10^-7*5*5/0.5
=10^-5 N
The force between the two wires is 10^-5 N repulsive.
Force:
Physics defines a force as an influence that has the power to change an object's motion. When changing its velocity, such as when moving away from rest, a massed object may accelerate as a result of a force. Being pushed or pulled is a simple way to convey force. Given its magnitude and direction, a force is a vector quantity. Using the newton SI unit, it is computed (N). The letter F represents force. As pushes or pulls are seen as forces, this can provide a clear explanation of how forces are described.
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A 75 kg person stands on a metric bathroom scale that reads in Newtons while in an elevator. The
elevator accelerates upward at 3 m/s/s. Determine the person's actual weight and the reading of the
scale under these conditions.
Answer: 735 N (actual), 960 N (accelerating up)
Explanation:
Actual weight = W = mg = (75 kg)(9.8 m/s²) = 735 N
Scale reading = N (normal force acting on the person by the elevator) = mg + ma = 735 N + (75 kg)(3.0 m/s²) = 735 N + 225 N = 960 N
That's why you feel heavier when you are accelerating up in an elevator
An old campfire is uncovered during an archacological dig. Its charcoal is found to contain less than 1/1000 the normal amount ofC. Find the minimum age (in years) of the charcoal. Carbon-14 has a half-life of 5730 years which means half of it will be gone aftler 5730 years. You may find the equality 210- 1024 to be useful, Numeric : A numeric value is expected and not an expression. min
Answer:
57104 yrs old
Explanation:
Its charcoal is found to contain less than 1/1000 the normal amount ofC-14.
1/1000 = (1/2)^n n = number of half lives = 9.965 half lives
9.965 half lives * 5730 yrs/half life = 57,104 years
you can improve the efficiency of a program by leaving a loop as soon as a match is found in the array. True or false
A program's efficiency can be increased by exiting a loop as soon as a match is discovered in the array.The given statement is true
What is programs efficiency?
The cost of producing goods or services in comparison to other programs or an ideal procedure is referred to as program efficiency. Analyzing expenses such as money, people, time, materials, etc. is related to cost effectiveness.
Program efficiency is the cost of producing goods or services in relation to other programs or an ideal technique. Cost effectiveness is related to the analysis of expenses such as cash, people, time, and materials, among other things.
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What is the speed of the wave if its wavelength is 3.0 m?; What is the wavelength of a wave with a speed of 12 m/s and a frequency of 3hz?; How do you find frequency when given wavelength and speed?; How do you find frequency of a wave?
The wavelength and speed of a wave are known, these can be used to find the frequency of a wave using the equation f=vλ f = v λ.
Wavelength can always be determined by measuring the distance between any two corresponding points on adjacent waves. In longitudinal waves, wavelength measurements are made by measuring the distance from one compression to the next or from one rarefaction to the next.
Forms of electromagnetic radiation such as radio waves, light waves, and infrared waves create characteristic patterns as they travel through space. Each wave has a specific shape and length. The distance between peaks is called the wavelength.
Wavelength is the distance between two wave crests and the same for wave troughs. Frequency is the number of oscillations that pass through a particular point in one second, measured in cycles per second this article discusses the relationship between wavelength and frequency.
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At an orange juice plant, orange juice pulp with a density of 1.25 g/ml passes through a pumping station where it is raised vertically by 5.76 m at the rate of 1,920,000 liters per day. The liquid enters and leaves the pumping station at the same speed and through pipes of equal diameter. (a) Determine the output mechanical power (in W) of the lift station. Ignore any energy loss due to friction. (b) Assume an electric motor continuously operating with average power 3.70 kW runs the pump. Find its efficiency.
The output mechanical power (in W) of the lift station is and efficiency of electric motor continuously operating with average power 3.70 kW runs the pump is 135475.2x10^3J. and efficiency is 0.065%
Given density of orange juice (ρ) = 1.25g/ml
Height of juice level (h) = 5.76m
rate of juice increases (r) = 1920000 lts/day
Through equal-diameter pipes, the liquid travels through the pumping station at the same speed as it does when leaving.
Average power = 3.70 kW = 3.7x10^3W
Time = 24h
Work done (W1) = Power x time taken = 3.70x10^3 x 24 = 88.8x10^3J
This is the difference in potential energies: the effort required to move water to a height. W2 = E1-E0 where E0 =0and E1 = mgh
m = density x volume = 1.25x10^3x1920m^3 = 2400x10^3kg
E1 = 2400x10^3x9.8x5.76 = 135475.2x10^3J
Work done (W2) = 135475.2x10^3J
efficiency = W1/W2 = 88.8x10^3/135475.2x10^3 = 0.00065 = 0.065%
Hence efficiency = 0.065%
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Which of the following could not be determined by an observation that only uses spectroscopy?
the chemical composition of a distant star
the angular size of a distant galaxy
the speed at which a distant galaxy is moving away from us
the surface temperature of a distant star
the rotation rate of a distant star
The angular size of a distant galaxy cannot be determined by an observation that only uses spectroscopy.
Astronomical spectroscopy can be used to examine the different wavelengths of light or radiation coming from matter found in space. Astronomical spectra can be observed to determine the chemical composition of stars and galaxies. Continuous spectrum can be examined by a researcher to determine the temperature of the star.
The angular size or angular diameter of a distant galaxy can be measured by Fourier technique. It is a technique that is based on the interference of light. Spectroscopy uses the dispersion of light to calculate a quantity.
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❧ What is the Refraction of Light?
Refraction is the bending of light (it also happens with sound, water and other waves) as it passes from one transparent substance into another.
The three pairs of metal same-size spheres have different charges on their surfaces, as indicated. Each pair is brought together, allowed to touch, and then separated. Rank from greatest to least the total amount of charge on the pairs of spheres after separation.
A) +6 +2
B) +6 -2
C) +6
After separation, the pairs of spheres' total charges will be in the following order: Qa -> Qc -> Qb.
How to find The Calculation?As specified in the query, here
Each pair is introduced, allowed to touch, and then separated.
which refers to payment via sharing.
The charge by sharing formula is Q = Q1 + Q2 / 2.
As a result, Pair A
Qa = +6+(+2)/2 = 4 represents the total charge for each pair.
Pair B
Qb = +6+(-2)/2 =2.
Pair C
Qc = +6+(0) / 2 =3.As a result, Qa -> Qc -> Qb will be the order of the total amount of charge on the pairs of spheres after separation, from greatest to least.
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at one particular moment, a 19.0 kg toboggan is moving over a horizontal surface of snow at 3.70 m/s. after 8.25 s have elapsed, the toboggan stops. use a momentum approach to find the magnitude of the average friction force (in n) acting on the toboggan while it was moving.
The average friction force acting on the toboggan is 8.25 N.
This is the force which acts between the surfaces when one body is moved on the surface of another body. Friction force opposes the motion of a body.
We are given,
[tex]V_{i[/tex]= 3.70 m/s
[tex]V_{f[/tex] = 0
Δv = [tex]V_{f[/tex]- [tex]V_{i[/tex]= 0 - 3.70 = -3.70m/s
Momentum is the product of mass and velocity.
Change in momentum,
Δ momentum = m Δv = 19 kg × (-3.70m/s) = 70.3 kg m/s
The average friction force [tex]F_{f[/tex] takes 8.25 seconds to bring the toboggan to a stop.
so impulse = [tex]F_{t[/tex] = [tex]F_{f[/tex]×8.25
Impulse is equal to Δ momentum, so Ff(8.25) = 70.3
[tex]F_{f[/tex] = 8.25 N
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A roller-coaster car may be represented by a block of mass 50.0 kg . The car is released from rest at a height h = 60.0 m above the ground and slides along a frictionless track. The car encounters a loop of radius R = 20.0 m at ground level, as shown. As you will learn in the course of this problem, the initial height 60.0 m is great enough so that the car never loses contact with the track. Find the kinetic energy K of the car at the top of the loop. Find the minimum initial height hmin at which the car can be released that still allows the car to stay in contact with the track at the top of the loop.
The answer is 9800 J = + K.
Solution:
For this we can use energy conservation, the block starts at h=60 m, and at the top of the loop it is at h=2 x 20 = 40 m
Then:
E1 = E2
[tex]mgh_1=mgh_2+K[/tex]
[tex]mgh_1=mgh_2=+K[/tex]
[tex]50\cdot 9.8(60-40)=+K[/tex]
[tex]9800\, J=+K[/tex]
The min-height property defines the minimum height of the element. If the content is less than the minimum height, the minimum height is applied. Minimum Height means the vertical distance measured from the slope as defined herein to the lower limit of the sign or sign structure. Sample 1 Sample. Minimum height means the minimum building height permitted on a property or part of a property.
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