Physics Questions and Answers November 18, 2022

A light train made up of two cars travels at .The weight of the wagon is 18 tons and that of the wagon is 13 tons.When the brakes are suddenly applied, a constant braking force of is exerted on each car.Determine a) the time required for the train to stop after the brakes are applied, b ) the force on the coupling between the cars while the

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An electric motor has an effective resistance of 58 and an inductive reactance of when working under load. The voltage amplitude across the alternating source is 420V. Calculate the current amplitude in A. 94

Calculate the tensions and compressions accordingly using only the first equilibrium condition. a 55deg , A 30 20 300 lb

Three forces in the xy plane act on a 5.80 kg mass 16.90 N directed at 710, 9.60 N directed at 1540, and 8.90 N directed at 259. All angles are measured from the positive xaxis, with positive angles in the CounterClockwise direction. Calculate the magnitude of the acceleration. Draw a careful picture. Calculate the x and y components of each

Gaussian beam formulae for Q2. Beam waist W (20) 2, Beam radius W(z) W 1 (). 2zo12 Wo 1 (9), Phase retardation 3 arctan (2) Radius of curvature R(z) z 1 Optical fluence (in J.m2) F(p) 2ET 247 exp2 ().,Q 2(c) Show that at large z, 00 2 Wo 5 Marks and estimate the value halfbeam divergence angle o for Wo 20 mm (with 10.6 m). Also,

Show how the wavefront curvature R(z) and the onaxis phase shift (0,z) of a Gaussian beam, written as a function of the phase retardation factor ((z) given at the end of this question, changes on going from z 0 to large values of z. Compute R(z) and (0,z) for z zu2 and z Zo Gaussian beam formulae for Q2. Beam waist W, (4), Beam radius W (z)

Presbyopia is the tendency to gradually become far-sighted (hyperopic) as you age. If you have normal vision when you are young, you have a near point of 25 cm. A. If the distance between your eye's lens and retina is 1.71 cm, what is the focal length of your eye's lens when you look at an object at your near point? f = cm B. As you get older,

A freezer has a coefficient of performance of 6.30. The freezer is advertised as using 543 kWhy. Note One kilowatthour (kWh) is an amount of energy equal to operating a 1kW appliance for one hour. (a) On average, how much energy does the freezer use in a single day (b) On average, how much thermal energy is removed from the freezer each day J (c)

A heat pump has a coefficient of performance of 3.85 and operates with a power consumption of 6910 W. (a) How much energy does it deliver into a home during 24 h of continuous operation (b) How much energy does it extract from the outside air in 24 h J

A box of mass m has a force F applied an angle to the horizontal. The block starts at rest and is on a smooth surface. a) Find an expression for the Work done on the box by each force that acts on the box as it moves in initial distance d. b) Find an expression for the net work done on the box while moving a distance d. c) Find an expression for

Mary is an avid game show fan and one of the contestants on a popular game show. She spins the wheel and after 1.5 revolutions, the wheel comes to rest on a space that has a 1,500.00 prize. If the initial angular speed of the wheel is 3.70 rads, find the angle through which the wheel has turned when the angular speed is 1.60 rads.

An electric current in a conductor varies with time according to the expression 1(t) 120 cos(120 m t), where is in amperes and t is in seconds. What is the total charge passing a given point in the conductor from t 1 s s to 120 240 a) 0.32 C b) 5.56 x 103 C c) 11.1 x 10 c d) 0.64 C e) 0

An AC voltage source and a resistor are connected in series to make up a simple AC circuit. If the source voltage is given by AV AVmax sin(2ft) and the source frequency is 19.0 Hz, at what time t will the current flowing in this circuit be 78.0 of the peak current ms

When a star collapses it significantly shrinks in size and spins up. Consider a star with a mass of M 2.2x1030 kg and an initial radius of R 7.1x105 km. If the initial period of rotation of the star is T 29.3 days, find the new rotational period after it collapses to a final radius of Rf 7.1x10 km. Treat the star before and after the collapse

My memory isnt great, but this problem might not be fully consistent with itself, or fully solvable with the given information. Feel free to define whatever quantities are missing or to exclude whatever inconsistent information is provided here. On your way back from exploring planet Chyspis, you wish to determine the density of a rock that you

Two airplanes leave an airport at the same time. The velocity of the first airplane is 690 m/h at a heading of 68.5 . The velocity of the second is 590 m/h at a heading of 156 . How far apart are they after 1.8 h?

1 You are exploring a new planet, Chyspis, which you have determined has a radius of 7.2 x 10 m. With you, you have a string and a small object. You suspend the object from the string, and observe that smallamplitude pendulum swings have a period of 2.2 s. You then launch the object at an angle 25 above the horizontal from shoulderheight (1.40 m)

We now consider the motion of a flash of light that is emitted from the ship described in Part A. Imagine that there is a flashlight on the pool table that emits a flash of light directed toward the bow of the ship, which is still traveling northward at 25.0 ms . The light encounters two photodiodes on the table that are spaced exactly 1.00

Spring force is described as Fk k(Delta x) Create a VPython program that uses a spring with k 515 Nm compressed to 4.6 cm to find the speed of a 405 grams mass at the point where the spring is no longer compressed.

You are designing a fountain for a Ghostbusters theme party. The liquid should be bright green and thicker than water, so it resembles ectoplasm (ghost slime), so you decide to use corn syrup and food coloring, which changes the density of the liquid. The fountain should launch slime 0.4 m into the air above the nozzle, which is 0.6 m above the

A very young and very excited child exerts a force of 1.62 N on a present of mass 0.25 kg that is at rest on a table. If the coefficient of kinetic friction between the present and the table surface is pk 0.35 and the coefficient of static friction between the present and the table surface is s 0.73 what is the strength of the frictional force

Calculate the linear acceleration of a car, the 0.270 m radius tires of which have an angular acceleration of 17.0 rads2. Assume no slippage and give your answer in ms 2. How many revolutions do the tires make in 2.50 s if they start from rest

An electron and a proton are both in motion near each other as shown in the figure below at this instant they are a distance r apart. The proton is moving with speed vp at an angle theta to the horizontal, and the electron is moving straight up with speed ve. (Assume the x direction is to the right and the y direction is upward. Indicate the

A uniform plank of length 2.00 m and mass 32.0 kg is supported by three ropes, as indicated by the blue vectors in the figure below. Find the tension in each rope when a 685N person is d 0.500 m from the left end. X Your response differs from the correct answer by more than 10. Double check your calculations. N magnitude of magnitude of

A train pulls out of a station at a speed of 35 kmhr. The trains horn emits sound at 281 Hz. The speed of sound in air is 326 ms. (a) What is the frequency heard by a traveller waiting at the station Number Hz (b) A second train approaches the station, travelling in the opposite direction. It travels at 35 kmhr, while blaring its horn at 281 Hz.

Determine the force of gravity acting on a 150,000 kg space station orbiting at a position 6.67E 6m from the center of the Earth. Use 5.98E 24kg for the mass of the Earth Question 19 options 1.31E 6N 2.46E 6N 1.47E 6N 3.12E 6N

An astronomical unit (AU) is defined as the mean distance from the earth to the sun, or 1.50x10^11 m. The dwarf planet Eris was discovered in 2005 orbiting 96.6 AU from the Sun, about 3 times as far out as Pluto. What is the mean speed of orbit for Eris?

An ideal gas occupies a volume of 2.6 cm at 20C and atmospheric pressure. Determine the number of molecules of gas in the container. Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. molecules (b) If the pressure of the 2.6cm volume is reduced to 3.0 x 101 Pa (an

A carousel of radius R 4 m has a mass of m, 500 kg. A single passenger of massm 40 kg takes a seat at radial position R2 2 m. Determine the distance of the center of mass position from tcenter of the carousel, Reumsd) 2.5 mc) 1.20 m

Stringed instruments, such as a guitar or bass, are an application of transverse string vibrations. A music note is essentially sound of a specific frequency. As the string is plucked, it vibrates at its natural frequency, causing the surrounding air to vibrate at the same frequency and creating a musical note. In music, a scale is any set of

You have 83.2 grams of ice at a temperature of 9.00 OC. Approximately how much energy (in Joules) is needed to change this ice into water at 0.00 OC

a 20.000kg truck hits if from behind at 80km. Whan fraction of the tomal momemum is represented by the urus (ii) percent) a) 97 b) 95 c) 88 d) 5 3

Planet Jorsk has a mass of 69.34 x 1025 kg, and radius is 80.9 x 103 miles, what would be the gravitational acceleration on the surface of Jorsk in ms Use G6.67x 1011 Nmkg2. 1mile 1609 m. 2.73

Many light bulbs are designed to burn out after 3000 hours (about 4 months). Assume that a 100 W bulb is left on for 3000 hours and that the cost rate of electricity is 9.8 centskWh. Calculate 1. The energy consumed in kWh. 2. The cost of the energy.

Nuclear waste material in a Physics laboratory is stored in a cylinder if height 4.8125 in and circumference 8.1875 in. What is the volume of this cylinder, measured in metric units?

A jar holds 2.78 L of ideal nitrogen gas (N2, which is a diatomic gas) at 0.86 C and at pressure 2.92 atm. The atomic mass of nitrogen is 14.0 gmol. The ideal gas constant is 8.31 Jmol.k, Avogadros Number is NA 6.022x1023 moleculesmol, and 1.00 atm 101.3 kPa. How many moles of gas are contained in the jar,A student wakes up late on a cool spring

A calorimeter is an insulated container which prevents the exchange of energy from an experiment's surroundings. Water at 85 o C in the amount of 100 grams is added to a calorimeter which contains 100 grams of water at 35 o C. Once these two amounts of water are mixed the highest temperature of the mixture is recorded to be 55 o C. What is the

A piece of metal weighing 68.7 was heated to 100.0 C and then put it into 100.0 mL of water (initially at 23.7 C). The metal and water were allowed to come to an equilibrium temperature, determined to be 27.8 C. The specific heat of water is 4.184 J/gC. Assuming no heat is lost to the environment, calculate the specific heat of the metal.?

20288 2. 3. 4. For uniform circular motion, write Vtangential in terms of T, and atangential in terms of a.. Under what conditions would the falling mass rise again to the same level from which it was released How do we eliminate the contribution of the shaft and crossbar to arrive at the experimental moment of inertia of the two masses How are we

F80 N 20 30 15 F 110 N F 150 N F 100 N X,Performs the calculation of the resultant force, the angle of FR as well as the representation graph in the plane

A sinusoidal EM plane wave with a frequency of 50 MHz travels in free space (vacuum) in the z direction. At z 0 and time t 0, the electric field has its maximum value of 450 NC and is pointing in the y direction. (a) Determine the wavelength and period of the wave. (b) Calculate the magnetic field (magnitude direction) at this point and time.

A block with a weight W10N is placed against a vertical wall with a small static friction coefficient u02 and is held stationary by a force applied as shown in the drawing, at a 30 angle relative to the horizontal What force magnitude is required at least, to prevent the block from sliding down b) 102 N c) 149 N d) 18.7 N a) 5.4 N

In a recent space shuttle experiment, power was produced by pulling a very long conducting wire behind the shuttle through Earths magnetic field. The phenomenon that was being studied likely involved the A. creation of a magnetic field through induction B. interaction of electrical and gravitational fields interaction of magnetic and gravitational

the energy diagram of the oxygen molecule O. The vibration of an O, molecule consists of both oxygen atoms oscillating in and out with equal amplitudes A more advanced analysis of the oscillations finds that two equal masses m oscillating at the ends of a spring with spring constant are equivalenthave the same frequency and energyto a single mass

A ball starts rolling with constant acceleration, starting from rest. After 10s, the ball is rolling at 5 ms. what is the balls acceleration 0.5 ms 0.5 ms2 2 ms2 1m 2 ms 0

A cat walks along a plank with mass M 7.94kg. the plank is supported by two sawhorses. The center of mass of the plank is a distance d1 0.884m to the left of sawhorse B. When the cat is a distance d2 1.06m to the right of the sawhorse B the plank begins to tip. What is the mass of the cat, m in kg

At least how many Calories does a mountain climber need in order to climb from sea level to the top of a 4.67 km tall peak assuming the muscles of the climber can convert chemical energy to mechanical energy with an efficiency of 13.0 percent. The total mass of the climber and the equipment is 84.2 kg. (Enter your answer as a number without units.)

a ladder of length L 12 m and mass m 48 kg leans against a slick (frictionless) wall. The ladders upper end is at height h 8.9 m above the pavement on which the lower end rests (the pavement is not frictionless). The ladders center of mass is L3 from the lower end. A firefighter of mass M 71 kg climbs the ladder. Let the coefficient of static

A skier slides down a steep 25.9 slope. On a slope this steep, friction is much smaller than the other forces at work and can be ignored. What is the skiers acceleration in ms

the generator at a power plant produces AC at 26,000 V. A transformer steps this up to 355,000 V for transmission over power lines. If there are 2,250 turns of wire in the input coil of the transformer, how many turns must there be in the output coil?

A thin hoop rolls along a flat plane at a constant speed. What percentage of its mechanical energy is rotational kinetic energy 2). A solid disk rolls along a flat plane at a constant speed. What percentage of its mechanical energy is rotational kinetic energy

A solid disk rolls along a flat plane at a constant speed of 4 ms. It then climbs a ramp with an angle of 20 deg. How high up the ramp does the disk roll 2).A 40 kg child is playing on a merrygoround (Radius 2 m, Mass 200 kg). When the child is at the edge of the merrygoround, its angular speed is 2 rads. When the child moves to the center, how

bands of bright lines are there between the (y0) and the position y12cm How many Central Maximum, 0.05mm Green light y12 m 1m Scran with 540nm

A 50.0 kg skier slides down a steep 34.9 slope. On a slope this steep, friction is much smaller than the other forces at work and can be ignored. Determine the normal force on the skier (Answer in Newtons.)

You stop by the union to grab a chickfila sandwich (440 Calories), waffle fries (400 Calories) and a 16 oz pepsi (200 Calories). If you burn 332 Joules per push up, how many pushups would you need to do to burn off the whole meal Note 1 Calories 4186 J.

an aluminum statue has a mass of 1.8 kg and becomes submerged in water. Will it sink or float?

Consider the onedimensional harmonic oscillator with potential energy V(x) mwr, and the spatial part of the ground state energy eigenfunction uo(x) Ne where N is a normalization constant that you do not need to determine. (i) Make a sketch of V(z) and a sketch of up (x). (ii) Show by direct substitution into the timeindependent Schrdinger

The drawing shows the top view of a door that is 1.60 m wide. Two forces are applied to the door as indicated. What is the magnitude of the net torque on the door with respect to the hinge (Answer in SI units) 0.800 m 35.0 12.0 N 12.0 N 35.0

Consider the skier on a slope with an tilting angle of 48.0. Her mass including equipment is 66.5 kg. What is her acceleration in unit of ms if friction coefficient between her and the slope is 0.2 Consider the skier on a slope with an tilting angle of 52.9. Her mass including equipment is 78.9 kg. What is friction coefficient between her and the

A 1 105.0 kg car traveling initially with a speed of 25.000 ms in an easterly direction crashes into the back of a 8 000.0 kg truck moving in the same direction at 20.000 ms. The velocity of the car right after the collision is 18.000 ms to the east. Vcf VTf VCi Before After (a) What is the velocity of the truck right after the collision (Give

A 0.62kg Slinky has 185 coils. When you and your friend stretch the Slinky by exerting a 4.0N force on its ends, the separation between the adjacent coils is 6.0cm. Determine the speed of the transverse wave on the Slinky.

A pulse travels at speed v on a stretched rope. By what factor must you increase the force you exert on the rope to cause the speed to increase by a factor of 1.90?

Can there be a stable and unchanging electric or magnetic field in a region of space with no charges (and thus no currents)? There could be charges or currents near the region, but not inside of it. Justify your answer using Maxwells equations.

Calculate the magnitude of F(BC) from the following truss. 2 m B A 500 N 45 2 m C,500.000 N 353.553 N 707. 106 N 843.259 N

An electromagnetic plane wave traveling in a vacuum has its electric field given by E, E, 0 and E 1000 Vm cos(10 m x wt). a) What is the frequency of the wave b) What is the direction of propagation c) What is the equation of the B field

Opening a freezer door. Initially a household freezer compartment is filled with air at room temperature T 28.2deg C. Then the door is closed and the cooling in the walls is turned on until the air temperature is at the recommended value of T 11.4deg C. The door has height h 0.650 m and width w 0.750 m, with hinges on the left edge (and thus

horizontal beam with mass distribution Uniform and one meter in length in rotational balance. Note that the body is suspended by a rope in the center of gravity (e.g.) at 50 cm. The mass of the meter is 150 g. What would be x in cm?

TxH 300 g 45 cm 100 g yu 50 cm c.g. 94 cm 200 g

A quantity of an ideal gas is stored in a rigid container of constant volume. If the gas is originally at a temperature of 18 oC, at what temperature will the pressure of the gas double from its original value Give your answer in degrees C.

On a cool spring morning (T = 7.7oC), a mechanic inflates a customer's tires to the manufacturer's recommended pressure of 30.2 PSI. That afternoon, the temperature unexpectedly soars to 25oC. Assuming there is no change in the volume of the tires, determine the pressure in the tires in the afternoon. Give your answer in PSI. (1 PSI = 6894.76 Pa)

A student wakes up late on a cool spring morning and realizes they are late for Physics class. They run to their car, start it, and begin driving to school immediately. Before the car is driven, the (absolute) tire pressure is 493.5 kPa and the air temperature is 284.2 K. As the car is driven down the road, the tires heat up and by the time the

You are on a train traveling north at 50 ms ( 100 mph). The train drives over a strong magnet that creates a Magnetic field of 1 Tesla pointing toward the sky. Find the force on a charge of 2 C that is traveling in the train with you. E

Two lasers are shining on a double slit, with slit separation d. Laser 1 has a wavelength of d20, whereas laser 2 has a wavelength of d15. The lasers produce separate interference patterns on a screen a distance 4.50 m away from the slits. Part A Which laser has its first maximum closer to the central maximum View Available Hint(s) Olaser 1 Olaser

50 V E In the figure are parallel conducting plates that have + 50V applied between them. The dashed vertical lines are: O Magnetic Field lines O Equi-potential lines O Force lines O Electric Field lines OV.

Which of the arrows is in the direction of the net force on charge B 1CB IC A 7 B D. 1C E. none of these

The person is leaning such that they make an angle of 60 with the horizontal. Their mass is 88.37 kg. When standing upright, their height is 2.0 m and the distance from the top of their head to their shoulders is 0.5 m. You may assume the persons center of mass is halfway up their body a)What is the tension force exerted by the rope? (b) What is

Find the rolling resistances in the following scenario:

Pr Na 100 Lbs. 12 .05

A 0.458 kg metal cylinder is placed inside the top of a plastic tube, the lower end of which is sealed off by an adjustable plunger. The cylinder comes to rest some distance above the plunger. The plastic tube has an inner radius of 6.22 mm and is frictionless. Neither the plunger nor the metal cylinder allow any air to flow around them. If the

Light of wavelength 640 nm falls on two slits that are separated by exactly 0.32 mm. a) What is the difference in angle between the locations of the first and second bright fringes? b) What is the difference in angle between the locations of the seventh and eighth bright fringes? c) Is the light getting more of less spread out as you get to larger

Calculate the "energy budget" (i.e., the absorbed power, emitted power (based on effective temperature), and intrinsic power) for Saturn. Note, that you can ignore the uncertainties (+/- values) in the table below.

TABLE 21.3 Energy Budgets and Effective Temperatures of the Giant Planets. Power or Temperature Absorbed power (106 W) Total emitted power (106 W) Intrinsic power emitted (106 W) Effective temperature (K) Jupiter 50.142.48 83.650.84 33.52.6 124.4 0.3 Saturn 95.00.4

1. What is the principle of oscilloscope? 2. What are the three main section of oscilloscope? 3. Can we use oscilloscope as a voltmeter? 4. What is an oscilloscope is connected to? 5. Where oscilloscope is used?

A) What are the differences between concave and convex lenses? B) A 4.00-cm tall light bulb is placed a distance of 8.30 cm from a double convex lens having a focal length of 15.2 cm. Determine the image distance and the image size. C) If the object is at a distance u = 10 mm away from a convex lens of focal length f = 15 mm, then the position v

1) Why does light bend when it travels from one medium to another? 2) For what incidence angle would light not bend when passing from water to glass? 3) A ray of light is traveling through air at an angle of 30 0 to the vertical. It passes into water and halves its angle to the vertical. What is the index of refraction of water? Where n air =1.00

Two billiard balls collide on the surface of a billiard table. The two balls are identical, with the same radius and each with a mass of5kg. The first ball is moving towards the other ball at8m/s,the second ball is at rest. a. What is the total momentum and energy of the system? b. If the two balls collide head on elastically, what is the new

A) State Total internal reflection. B) Draw the Ray tracing for concave and convex mirror, also explain about the Focal point in both? C) Draw the important sets of rays for concave and convex lens, explain about the image obtained in both lenses?

For the steel shaft ABC in figure, determine A) The shearing stress in portions AB and BC B) the total angle of twist in degrees at point A. Portion BC Solid circular d 100 mm Portion AB square 70 X 70 mm. G80 x10 MPa. C 0.75 m B 1m 6 kN.m 2 kN.m

The designers of a particle accelerators use electromagnetic fields to boost particles to relativistic speeds while at the same time constraining them to move in a circular path inside a donut shaped evacuated cavity. imagine a particle travelling in such an accelerator in a circular path of radius 7.01 m at a constant speed of .9994 (as measured

A 100 kg one-man bobsled starts from rest 50 m from the end of an icy, 15 slope. A giant 2.0-m-long spring is placed against a barricade at the bottom of the slope. (Figure 1) shows a coordinate system with the origin at the base of the spring. The bobsled brake fails to work, and the sled crashes into the spring. The spring compresses 75 cm

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In the decay 28 Th MeV and the next highest energy is 5.341 MeV. a) Compute the Q value for the decay from the measured 224 Ra. Ra, the highest energy b) Compute the energy of the first excited state of 228 Th 9 Q 224 Re Ground state particle has an energy 5.423 T 5.423 MeV T 5.341 MeV 2 energy. 1

A 2kg block is suspended by a spring of unknown spring constant. At equilibrium (i.e., just hanging there but not moving), the spring is stretched 10.1 cm. The block is pulled down an additional 5 cm and released. Assume g 10 Nkg. What value of spring constant would be required to double the period compared to the original situation

Having successfully survived his first bungee jump, Ron is hanging at rest from the end of the bungee cord. I wonder what the spring constant of this bungee cord is he asks himself. So he decides to perform an experiment. He pulls himself up about 70 cm and lets go. As he begins to bob up and down, he times his bounces and finds that he completes

A particle with positive charge q 4.01 x 1018 C moves with a velocity v (41 41 k) ms through a region where both a uniform magnetic field and a uniform electric field exist. (a) Calculate the total force on the moving particle, taking B (51 23 k) T and E (51 1 2K) Vm. (Give your answers in N for each component.) Fx N Fy F N N (b) What

A police radar gun works by reflecting radar waves off approaching cars. The gun sends out a microwave signal, and then measures the beat frequency between the outgoing wave and the incoming reflected wave. A particular type gun sends out a signal with a wavelength of 7.7mm. If it measures a beat frequency of 5.71kHz, what is the speed of the