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Physics Questions and Answers October 24, 2019

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In a type of amusement park ride sometimes called the "gravitron", the people are spun around inside a large cylinder. If the rate of rotation is great enough the rider may "stick" to the inside wall of the cylinder with their feet not touching the floor. Suppose the radius of the cylider is 2 . 0 m and that it rotates with a frequency of 1 . 1 hz

The drawing shows two strings that have the same length and linear density. The left end of each string is attached to a wall, while the right end passes over a pulley and is connected to objects of different weights ( WA and We ) . Different standing waves are set up on each string, but their frequencies are the same. If Wa = 4 4 N , what is We ?

What essentially Bernoulli's Eq is ? Conservation of momentum Ideal gas low Conservation of mass Conservation of energy

what is the de broglie wavelength of an electron ( m = 9 . 1 1 x 1 0 - 3 1 kg ) in a 5 . 0 x 1 0 3 volt

A parallel - plate air - filled capacitor having area 3 5 cm ^ 2 and plate spacing 1 . 4 mm is charged to a potential difference of 5 2 0 V . Find ( a ) the capacitance, ( b ) the magnitude of the charge on each plate, ( c ) the stored energy, ( d ) the electric field between the plates, ( e ) the energy density between the plates.

Problem 5 : The Moon and Earth rotate about their common center of mass, which is located about 4 7 0 0 km from the center of Earth. ( This is 1 6 9 0 km below the surface. ) Calculate the acceleration due to the Moon s gravity at that point. Calculate the centripetal acceleration of the center of Earth as it rotates about that point once each

Item 2 2 of 2 Constants Part A What can you say about the linear momentum p p of the kid in the ferris wheel? Its magnitude is constant but direction is changingBoth its magnitude and direction are constantBoth its magnitude and direction are changingIts magnitude is changing but direction is constantThere is not enough information in the problem

Following vigorous exercise, the body temperature of an 8 0 . 0 kg person is 4 0 . 0 C 4 0 . 0 C . At what rate in watts must the person transfer thermal energy to reduce the body temperature to 3 7 . 0 C 3 7 . 0 C in 3 0 . 0 min, assuming the body continues to produce energy at the rate of 1 5 0 W ? ( 1 watt = 1 joule / secondor 1 W = 1 J / s )

A pulsar is a rapidly rotating neutron star. Suppose that a particular pulsar has period 2 8 . 5 * 1 0 ^ 3 s , radius 5 . 7 km , and mass 1 . 1 1 0 ^ 2 7 kg . Assume the pulsar is spherical in shape.The pulsars rotational period will increase over time due to the release of electromagnetic radiation, which doesnt change its radius but reduces its

A GPS satellite develops a fault whereby it moves into an orbit 1 9 5 0 0 km above the Earth s surface and also emits a weak signal whose power is only 2 3 W . What will be the power per square metre of the signal received on the Earth s surface? Choose the nearest value from the list below. ( W / m 2 represents watts per square metre . )

A + 5 . 0 uC charge experiences a 0 . 2 0 N force in the positive y direction. If the charge is replaced with a - 2 . 7 uC charge, what force will it experience?

The average lifetime of a pi meson in its own frame of reference ( i . e . , the proper lifetime ) is 2 . 6 1 0 - 8 s . ( a ) If the meson moves with a speed of 0 . 9 3 c , what is its mean lifetime as measured by an observer on Earth? s ( b ) What is the average distance it travels before decaying, as measured by an observer on Earth? m ( c )

Consider a loop with 6 . 2 A of current that makes an 5 - sided regular polygon, where the distance from the center of each side to the center of the polygon is 2 . 7 cm . What is the magnitude of the magnetic field caused by the loop at the center of the loop? Give your answer in units of T . Consider a loop with 6 . 2 A of current that makes an

At what speed ( in m / s ) would a 2 . 1 7 1 0 4 kg airplane have to fly to have a momentum of 2 . 1 1 1 0 9 kg m / s ( similar to the momentum of a large moving ship ) ? m / s ( b ) What is the plane's momentum ( in kg m / s ) when it is taking off at a speed of 5 4 . 3 m / s ? kg m / s ( c ) If the ship is an aircraft carrier that launches these

What is the magnitude of the tension in the cord? Answer in units of N .
What is the magnitude of the tension in the cord?

Give brief explanations, terms and use of the following equations. ( a ) h = z +

A nonuniform bar of weight w is suspended at rest in a horizontal position by two light cords as shown in the figure. The angle one cord makes with the vertical is = 3 6 . 9 . The other makes an angle of = 5 3 . 1 with the vertical. The length L of the bar is 6 . 1 m . Determine the distance x from the left - hand side of the bar to the center of
A nonuniform bar of weight w is suspended at rest

In the radioactive decay equation 2 3 8 9 2 U 2 3 4 9 0 Th + X 9 2 2 3 8 U 9 0 2 3 4 Th + X , what is XX ? + +

what if it was found that the thermometer read . 5 celsius to high

For hydrogen, what is the energy of the first excited state? Select the correct answer 6 . 8 eV 3 . 4 eV - 6 . 8 eV - 1 3 . 5 eV - 3 . 4 eV 1 3 . 6 eV

points each ) To capture a fox, a net fired at an angle of 4 5 degrees relative to the ground and pointing directly E . It reaches the apex of its parabolic trajectory at a height of 2 0 m after 1 . 2 s . Howqyer, a strong wind is also blowing at 2 . 5 m s from the North. How far did the net travel and what is its location relative to the launcher?
points each ) To capture a fox, a net fired at an

A 1 . 0 - m - long segment of wire lies along the x - axis and carries a current of 2 . 0 A in the positive x - direction. Around the wire is the magnetic field of ( 3 . 0 hat ( i ) 4 . 0 hat ( k ) ) 1 0 - 3 T . Fin the magnetic force on this segment.
A 1 . 0 - m - long segment of wire lies along the

Your answer is partially correct. Light of wavelength 4 5 8 nm is incident on a diffraction grating that has 1 . 6 7 1 0 3 line s c m . What angle does the second principal maxima make with respect to the central principal maximum? = Number Units
Your answer is partially correct. Light of

what are the constants of motion

Which of the following statements about systematic and random errors are correct? Random errors can be eliminated with an infinite number of measurements. Systematic errors are often caused by factors such as bias or calibration errors. Random errors have no effect on precision. Systematic errors affect the accuracy of measurements. Systematic
Which of the following statements about

The options below refer to the possible magnetic field of a charged particle. Which combination of options below is most accurate? [ Enter your answer as a string of the letter options you believe are correct. For instance, if you think options A , D , and E are correct, then enter "ADE" ] A ) Magnetic fields curl around the position of the source
The options below refer to the possible magnetic

You are interested in compressing a wooden post of height l , by resting a 1 0 0 kg block on top of it . How do you expect the post s change in height to depend on it s cross - sectional radius? l radius l radius l radius l radius 4 0

. Two bullets are fired straight up from the same location with different initial velocities. Bullet # 1 is in the air for four times as long as bullet # 2 . Which bullet goes higher, and by how much? Ignore air resistance

a ) Calculate the initial Kinetic Energy, using Eq . 5 . 1 6 , and the final Kinetic Energy, using both Eq . 5 . 1 7 and Eq . 5 . 1 8 . How do the two final Kinetic Energy values obtained using the latter two equations compare with each other? Explain your reasoning. ( b ) Determine the amount of Kinetic Energy lost in the collision ( your answer

The weight of an astronaut plus his space suit on the Moon is only 1 5 7 N . How much ( in N ) do they weigh on Earth? ( The acceleration due to gravity on the Moon is 1 . 6 7 m / s 2 . ) N What is the mass ( in kg ) on the Moon? kg What is the mass ( in kg ) on Earth? kg

what is the velocity at time 0 . 3 3 s

A fighter plane is directly over an aircraft gun at time t = 0 The plane has a speed V _ { 1 } of 5 0 0 km / hr . A shell is fired at t = 0 in an attempt to hit the plane. If the muzzle velocity V _ { 0 } is 1 0 0 0 m / s how many meters d should the gun be aimed ahead of the plane to hit it ? What is the time of impact?

An iron - core solenoid is 3 3 cmcm long and 1 . 4 cmcm in diameter, and has 5 2 0 turns of wire. The magnetic field inside the solenoid is 2 . 0 TT when 6 0 AA flows in the wire. Part A What is the permeability at this high field strength?

A ball with original momentum + 7 . 0 kg m / s hits a wall and bounces straight back without losing any kinetic energy. The change in momentum of the ball is

What is the magnitude of the momentum of a 2 5 0 0 kgkg car traveling at 1 2 m / sm / s ?

Two identical blocks slide along two different vertical loops of radii r 0 and 2 r 0 . At the top of each loop, the blocks have the minimum velocity required to remain in contact with their respective loops. What is the ratio of the centripetal acceleration of the block in the smaller loop to the centripetal acceleration of the block in the larger
Two identical blocks slide along two different

what is the de broglie wavelength of an electron whose kinetic energy is 1 ev

Problem 4 In a beam of white light ( wavelengths from 4 0 0 to 7 5 0 nm ) , what range of momentum can the photons have?
Problem 4 In a beam of white light ( wavelengths

7 Mark for Review AD A satellite of mass m is in a circular orbit of radius R about a planet of mass M . The period of the satellite's orbit is T . A second satellite of mass 2 m is in a circular orbit of radius 2 r around the same planet. The period of orbit for the second satellite is 2 T ( D ) 8 2 T 4 T
7 Mark for Review AD A satellite of mass m is in

A interference pattern is formed by lights with wavelength = 6 0 0 nm . For which path difference will there be a constructive interference 2 0 0 , 9 0 0 , 1 2 0 0 , 1 5 0 0

Two objects A and B of the same masssubmerge in a liquid. If A has twice the density of B , The buoyant force on A is " twice the buoyant force on B half the buoyant force on B the same as buoyant force on B there is no way to tell none of these

What is the pressure difference on your 0 . 3 5 cm 2 eardrum when you are 5 meters below the surface of a body of freshwater? Assume the pressure difference was zero before you dove into the water.

Suppose you have two identical objects A and B in thermal contact with one another. Model each as having 2 5 bins for thermal energy. At the start, A has 7 packets of thermal energy and B has three packets . a ) Initially, how many microstates are there for A ? For B ? b ) If two packets of thermal energy move from A to B , find: SA , SB , and

A jetskier is moving at 8 . 4 m / s in the direction in which the waves on a lake are moving. Each time he passes over a crest, he feels a bump. The bumping frequency is 1 . 2 Hz , and the crests are separated by 5 . 8 m . What is the wave speed?

do xrays have more energy than a red photon

with light of wavelength 5 2 0 nm , photoelectrons are ejected

When this spring is instead stretched two - thirds of the distance it was compressed, its remaining potential energy in the same units will be

A 1 2 0 0 kg car moving at 1 8 0 0 km / h comes to a stop in 6 . 0 seconds, what is the inital velocity ?

Worksheet for Exploration 1 3 . 1 : Balance a Mobile The center of gravity is at the same location as the center of mass for systems where the acceleration due to gravity is virtually equal for all points in the system.

The statements below refer to an object on an inclined plane where A is the angle of the incline. Fill in the statements below with the words "increase", "decrease" or "remain the same". increase decrease remain the same When A increase the weight of the object will _ _ _ _ . increase decrease remain the same When A increases the force of friction

A substance is heated from 5 0 C to 7 0 C . What would the same incremental change be when registered in kelvins

Four passengers with combined mass 2 5 0 kg compress the spring of a car with worn - out shock absorbers by 4 . 0 0 cm when they get ni . Model the car and passengers ni a single body on a single ideal spring. fI the loaded car has a period of vibration of 1 . 0 8 s , what si the period of vibration of the empty car?

A mass of 1 1 . 0 kgkg , fastened to the end of an aluminum wire with an unstretched length of 0 . 4 9 mm , is whirled in a vertical circle with a constant angular speed of 1 2 1 rev / minrev / min . The cross - sectional area of the wire is 1 . 7 1 0 2 cm 2 cm 2 .

2 Figure 2 shows a uniformly charged non - conducting ring of radius R . The charged ring has a charge density . Point P located at a distance Z from the central axis. r is the distance between point P and the infinitesimal charge element d d . What is the electric potential at point P in terms of Z , R and ? [ 6 marks ]
2 Figure 2 shows a uniformly charged non -

A particle undergoes simple harmonic motion. What is the phase difference between its displacement and velocity when it passes through the equilibrium position? a ) 0 degrees b ) 4 5 degrees c ) 9 0 degrees d ) 1 8 0 degrees

A 2 . 7 5 - g copper coin at 1 5 . 0 C drops 5 5 . 0 m to the ground. ( a ) Assuming 6 5 . 0 % of the change in gravitational potential energy of the coin Earth system goes into increasing the internal energy of the coin, determine the coin's final temperature. C ( b ) Does the result depend on the mass of the coin? YesNo

A nonrelativistic free particle has a mass of 5 . 6 x 1 0 ^ - 2 7 kg and a kinetic energy of 6 . 6 x 1 0 ^ - 1 4 J

Block 1 , with mass m 1 and speed 3 . 4 m s , slides along an x axis on a frictionless floor and then undergoes a one - dimensional elastic collision with stationary block 2 , with mass m 2 = 0 . 5 3 m 1 . The two blocks then slide into a region where the coefficient of kinetic friction is 0 . 3 1 ; there they stop. How far into that region do ( a
Block 1 , with mass m 1 and speed 3 . 4 m s ,

1 Alternating current generator A square loop ( sidea ) is mounted on a vertical shaft and rotated at angular velocity . A uniform magnetic field B points to the right. Find the E ( t ) for this alternating current generator. Remember that E ( t ) = - d d t . Figure 1 : Alternating current generator.
1 Alternating current generator A square loop (

You are standing at x = 9 . 0 k m and your assistant is standing at x = 3 . 0 k m . Lightning bolt 1 strikes at x = 0 k m and lightning bolt 2 strikes at x = 1 2 . 0 k m . You see the flash from bolt 2 at t = 2 0 s and the flash from bolt 1 at t = 6 0 s . Part A According to your assistant, were the lightning strikes simultaneous? View Available
You are standing at x = 9 . 0 k m and your

Some airliners use wires of aluminum ( resistivity 2 . 7 5 1 0 8 2 . 7 5 1 0 8 m m ) rather than copper to reduce weight. The potential difference between the ends of an aluminum wire 3 4 . 0 mm long is 1 . 4 5 VV when the wire carries current 1 . 2 0 AA . Find the electric - field magnitude inside the wire. Express your answer with the

A pipe has a length of 0 . 9 4 5 m and is open at both ends. Take the speed of sound to be v = 3 4 3 m / s . ( a ) Calculate the two lowest harmonics of the pipe ( in Hz ) . ( Enter your answers from smallest to largest. ) Hz Hz ( b ) Calculate the two lowest harmonics ( in Hz ) after one end of the pipe is closed. ( Enter your answers from

A simple harmonic oscillator consists of a block of mass 3 . 8 0 kg attached to a spring of spring constant 4 9 0 N / m . When t = 1 . 6 0 s , the position and velocity of the block are x = 0 . 1 3 8 m and v = 4 . 4 8 0 m / s . ( a ) What is the amplitude of the oscillations? What were the ( b ) position and ( c ) velocity of the block at t = 0 s

1 . How much energy is needed ( in kWh ) to heat 1 0 kg of water from 2 5 C to 8 5 C in a sterilizer? 2 . If the electric stove operates at 8 0 % efficiency, how much electrical energy must be supplied to the stove to meet the required heat input for sterilization? 3 . Discuss how understanding the heat balance can help design more energy -

tion 1 0 Having wrapped up your work on the smaller projects, you are finally able to turn your attention to the project you are most excited about: research! Being one of Casey's projects, the files needed are password protected. Once again, you review the hint that Casey has left as a reminder of the password. Find an exact solution for l n ( 4
tion 1 0 Having wrapped up your work on the

A square loop of wire with a small ressistance is moved with constant speed from a field free region into a region of uniform B field ( B is constant in time ) and then back into a field free region to the right. The self inductance of the loop is porlinihlo I When entering the field the coil experiences a magnetic force to the right. When leaving
A square loop of wire with a small ressistance is

Question 1 5 1 pts If the mass of a radioactive sample is doubled, the decay constant remains the same. decreases by a factor of 1 / 2 . increases by a factor of l n ( 2 ) . doubles. decreases by a factor of l n ( 2 ) .
Question 1 5 1 pts If the mass of a radioactive

water flows at speed 4 . 6 m / s through a horizontal pipe diameter 3 . 2 . the gauge pressure P 1 of the water in the pipe 1 . 5 atm. A short segment of the pipe is constricted to a smaller diameter 2 . 5 cm . what is the gauge pressure of the water flowing through the constricted segment?

A block sliding on a frictionless surface at 2 0 m / s a spring, which returns the black at the same speed if the black mass was 5 kg what is the impulse the block experiences?

A hoop and a disk, each with a diameter of 5 0 cm , roll from the top of an incline. If mass of the hoop is 1 0 kg and that of disk is 8 kg then what are their angular momenta at the bottom if the initial height is 3 0 m ? Hoop Disk
A hoop and a disk, each with a diameter of 5 0 cm

An ice cube floats in a glass of water. As the ice melts, what happens to the water level? It remains the same. It falls by an amount that cannot be determined from the information given. It rises. It falls by an amount proportional to the volume of the ice cube.
An ice cube floats in a glass of water. As the

You have a single wire with 1 1 0 A of current flowing through it . How far out from the wire do you need to be to have Zero magnetic field? 9 . 0 m 1 2 . 5 6 m 8 0 . 0 m 1 1 0 mAll the way to the edge of the universe and beyond.Question at position 2 1 2 1 Multiple Choice 3 . 2 points Question at position 2 1 What is NOT a function of a

The phenomenon where collided though suspension scatter rays of light is known as the what effect

An ice skater has a moment of inertia of 5 . 0 kgm ^ 2 when her arms are outstretched, and at this time she is spinning at 3 rev / s . If she pulls her arms and decreases her moment of inertia to 2 . 0 kgm ^ 2 how fast will she be spinning?

QUESTION 5 A star is a balance between outward force and the inward pull o A . nuclear; gravity B . fusion; fission C . magnetic: gravity D . gravity, nuclear force
QUESTION 5 A star is a balance between outward

What is the frequency of an instrument if it is played with a tuning fork having a frequency of 4 1 9 Hz and it produces a 3 Hz beat frequency, and when played with a 4 1 2 Hz tuning fork it produces a beat frequency of 4 Hz ?

Bohr's model of the hydrogen atom involved a negative electron orbiting the positive nucleus. What was the fundamental force that supplied the centripetal acceleration to keep the electron in orbit? Select the correct answer coulombic gravitational centripetal spring magnetic

A fully charge isolated capacitor is connected to a resistor in series and the charge on the capacitor diminishes by 2 0 % , after 2 2 seconds. What percent of the initial charge is left on capacitor after 6 6 seconds of being connected to the resistor? ( Round to 2 significant digits )

in what direction are the torque T and angular acceelration a ? are torque and angular acceleration

A person pushes a block of mass M = 6 . 0 kgM = 6 . 0 kg with a constant speed of 5 . 0 m / s 5 . 0 m / s straight up a flat surface inclined 3 0 o 3 0 o above the horizontal. The coefficient of kinetic friction between the block and the surface is = 0 . 4 0 = 0 . 4 0 . What is the net force acting on the block?

A spring is stretched by 3 5 cmcm and attached to a 5 0 0 gg air - track glider, which is then released. The spring does 0 . 3 5 JJ of work on the glider as it returns to its equilibrium length.

Suppose you have a circuit containing a source and a capacitor, which has a 3 . 2 5 M reactance produced at the source frequency of 4 5 Hz .

A worker pushes horizontally on a 2 3 0 0 - N refrigerator on a kitchen floor with a force of 2 7 . 0 N . If the refrigerator moves forward, this person feels it pushing back with less than 2 7 . 0 N . The person always feels a 2 7 . 0 N push from the refrigerator.The person feels a 2 7 . 0 N push from the refrigerator only if it does not move.The

In this part we shall find the center of mass without integration but using the result of a cone, ycm = H / 4 ycm = H / 4 which we obtained by integration in class. We put our truncated cone of height hh right side up , that is on its base, on the x - z plane. We bring the cut off part also of height hh on top of it . The center of mass of the

Leukemia is the massive proliferation of _ _ _ _ _ _ _ _ _ _ .

An electron and a 1 4 0 - g baseball are each traveling 1 0 5 m / s measured to a precision of 0 . 0 3 5 % . Calculate the uncertainty in position of the electron. Calculate the uncertainty in position of the baseball. Compare the uncertainty in position of each.

In the "case of the missing fundamental," a person hears the pitch of a complex tone correctly, even when the fundamental frequency is removed. What information do we use to determine this pitch? Group of answer choices The average frequency of all harmonics The intervals between harmonics ( periodicity ) The amplitude of the sound wave The

A . 1 5 kg rock tied to a 0 . 8 m long string is swung in a vertical circle. At the top of the circle the rocks highest point it mofes at a sleed of 1 0 m / s at the bottom of the circle the rocks lowest point it moves at a speed of 1 1 . 5 m / s

Projectile motion What is one of the assumptions that must be made in order to predict the range of the projectile in Part II of this experiment? Group of answer choices that the launch speed is independent of launch angle that the mass of the ball is negligible that air resistance is significant that the ball lands at a height that is

2 0 ) One of the standing - wave vibration possibilities of a column of air in a tube that is open at one end and closed at the other has a frequency of 4 4 8 Hz , and the next higher vibration possibility has a frequency of 5 7 6 Hz . How long is the tube? The speed of sound in air is \ ( 3 4 3 \ mathrm { ~m } / \ mathrm { s } \ ) . A ) 1 . 3 4 m
2 0 ) One of the standing - wave vibration

What is the SI unit of work? Multiple Choice Joule ( denoted as J ) . Newton / meter ( denoted as N m ) . Newtons ( denoted as N ) . Foot - pound ( denoted as ft - 1 b ) .
What is the SI unit of work? Multiple Choice

X - rays of wavelength 1 . 5 2 0 \ times 1 0 2 nm are scattered from a carbon atom. The wavelength shift is measured to be 3 . 2 6 \ times 1 0 4 nm . a ) What is the scattering angle? = b ) How much energy, in , does each photon impart to each electron?

Two events occur in an inertial system K as follows: Event 1 : x 1 = a , t 1 = 2 a c , y 1 = 0 , z 1 = 0 Event 2 : x 2 = 2 a , t 2 = 3 a 2 c , y 2 = 0 , z 2 = 0 Is there a frame K ' in which the two events occur at the same place? Explain.
Two events occur in an inertial system K as

as that of B , and A has five times as many turns as B . What is the ratio of the inductance of solenoid A to that of solenoid B ? 2 5 5 1 1 5 1
as that of B , and A has five times as many turns

Two objects have precisely the same volume but different masses. When object A is placed in water, it sits in equilibrium just barely below the surface. When object B is placed in the water, it sinks and rests slightly rough bottom surface of the container holding the water. On which of the objects is the buoyant force greatest?

Two violin strings are tuned to the same frequency, 2 9 4 Hz . The tension in one string is then decreased by 2 . 5 % . What will be the beat

The dog stands two meters from the left end and weighs 4 0 0 N . The cat stands 7 meters from the left end and weighs 3 0 0 N . The uniform beam is 9 meters long and has a weight of 2 0 0 0 N . a . What is the tension in cable A ? b . What is the tension in cable B ?
The dog stands two meters from the left end and

a string has a linear density of 7 . 9 x 1 0 ^ - 3 kg / m and is under tension of 2 9 0 m . the string is 1 . 2 m long, is fixed at both ends

A playground merry - go - round has a radius of 3 m and a rotational incrtia of 6 0 0 k g * m 2 . It is initially spinning at 0 . 8 r a d s when a 2 0 kg child crawls from the center to the rim. When the child reaches the rim the angular velocity of the merry - go - round is: 0 . 6 2 r a d s 0 . 7 3 r a d s 1 . 1 r a d s 0 . 8 r a d s 0 . 8 9 r a
A playground merry - go - round has a radius of 3

Question 7 1 pts Kinetic energy is the energy that an object possesses because of its motion True False
Question 7 1 pts Kinetic energy is the energy

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