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Physics Questions and Answers October 20, 2019

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If a 3 0 0 g sample of a substance with a specific heat capacity of 5 0 0 J / kg C is heated to 1 0 0 C and then placed into 1 kg of water at 2 0 C , what will be the final temperature of the system

Constants Two masses, m and 2 m , are each forced to go around a curve of radius R at the same constant speed. Part A If , as they move around this curve, the smaller mass is acted upon by a net force F , then the larger one is acted upon by a net force of 4 F . F . 2 F . 1 2 F
Constants Two masses, m and 2 m , are each forced

What is the speed of light in a material for which the critical angle at an interface with air is 6 2 . 0 ? Express your answer in meters per second. Activate to select the appropriates template from the following choices. Operate up and down arrow for selection and press enter to choose the input value typeActivate to select the appropriates

The fact that a pin placed carefully on the surface of the water can remain there without sinking is best explained by a . gravitation. b . surface tension. ? 2 c . Archimedes' principle. d . viscosity.
The fact that a pin placed carefully on the

A non - conducting thin disk of radius R , positively charged with surface density sigma uniformly over one side, rotates about its axis with an angular velocity w . In the same plane with the disk, a long, straight wire, is located at a distance D from the center of the disk as shown in the figure. What are the magnitude and direction of the

QUESTION 1 - Chapter 1 2 : Kinetics of Particles A 1 2 0 kg ammunitions box is sitting on an inclined plane as shown in the figure below. One of the military commanders is attempting to push the ammunitions box up the incline by applying a pushing force, F . The coefficient of static friction ( s ) between the box and the surface of the incline is
QUESTION 1 - Chapter 1 2 : Kinetics of Particles

In a Llyod s mirror experiment the ratio of the intensities at the interference maxima and minima if the mirror reflects only 7 5 % of the light incident on it

Your friend is 4 . 4 0 m away from you in a room. There are no significant air currents. She opens a bottle of perfume, and you first smell it 2 0 . 0 s later. How long would it have taken for you to smell it if she had been 8 . 8 0 m away instead? s
Your friend is 4 . 4 0 m away from you in a room.

4 3 1 9 K 4 3 2 0 Ca + X 1 9 4 3 K 2 0 4 3 Ca + X . What sort of particle is XX ?

For a certain transverse standing wave on a long string, an antinode is at x = 0 and an adjacent node is at x = 0 . 5 0 m . The displacement y ( t ) of the string particle at x = 0 is shown in the figure, where the scale of the y axis is set by y s = 4 . 2 c m . When t = 0 . 5 0 s , what is the displacement of the string particle at ( a ) x = 0 .
For a certain transverse standing wave on a long

1 . An electron is confined to a 1 - dimensional infinite potential box 1 . 0 nm long. How many energy levels have energy less than 1 0 eV ( 1 eV = 1 . 6 1 0 - 1 9 J ) ?

What is the intensity of a sound with a measured intensity level of 8 5 dB ? I 0 = 1 X 1 0 - 1 2 1 0 - 1 2 W / m 2 )

As the speed of a charged particle moving perpendicular to a uniform B - field increases, the radius of the trajectory

consider a 0 . 1 5 cm focal length microscope

Kinesics includes pitch silence, jester s tone inflection

A 4 5 . 7 kg girl is standing on a 1 5 9 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The girl begins to walk along the plank at a constant velocity, in the positive direction, of 1 . 7 8 m / s relative to the plank. What is her velocity relative to the ice surface? Tries 0 / 1

Doppler Effect of EM Waves Two starships, the Enterprise and the Constitution, are approaching each other head - on from a great distance. The separation between them is decreasing at a rate of 7 8 5 . 0 km / skm / s , 1 km = 1 0 0 0 m . The Enterprise sends a laser signal toward the Constitution. The Constitution observes a wavelength 6 8 8 . 2

When tightening a bolt, you push perpendicularly on a wrench with a force of 1 3 1 1 3 1 N at a distance of 0 . 1 6 0 0 . 1 6 0 m from the center of the bolt. How much torque are you exerting in newton - meters relative to the center of the bolt?

While sliding a couch across a floor, Andrea and Jennifer exert forces FA and FJ on the couch. Andrea's force is due north with a magnitude of 1 5 0 . 0 N and Jennifer's force is 3 3 east of north with a magnitude of 2 1 0 . 0 N .

d . What is the charge density 2 of given variables. [ 3 ]
d . What is the charge density 2 of given

A block is given an initial speed of 4 . 0 m / s up an incline of 2 2 . 0 . a ) How far up the plane will it go ? b ) How much time elapses before it returns to its starting point? Ignore friction

Problem: A centrifuge rotor is accelerated from rest to 2 0 , 0 0 0 rpm in 3 0 sec . ( a ) what is its average angular acceleration? ( b ) How many revolutions has the centrifuge rotor turned during its acceleration period, assuming constant angular acceleration?

~ T v F T is true F is false is tje statement true or false , name the main operater and is the operator true or false

Consider a guitar string of length 6 4 5 mm . Let the x axis run from one end of the string to the other end; thus 0 x L . Suppose you pluck the string by sharply pulling it up at point x 0 = 1 5 2 mm and letting go . This sets pulses traveling in both directions; at the ends of the string, the pulses are reflected back, and eventually they meet

A particle has a rest mass 6 . 6 4 1 0 2 7 kg 6 . 6 4 1 0 2 7 kg and momentum 2 . 1 1 1 0 1 8 kg m / s 2 . 1 1 1 0 1 8 kg m / s .

you land on a planet with half the mass and half the radius of earth. what would your weight on this planet be compared to your earth weight? twice as much, four times as much, half as much, one fourth as much

6 - 6 2 . Determine the force P required to hold the 1 5 0 - k g crate in equilibrium. The two cables are connected to the bottom of the hanger.
6 - 6 2 . Determine the force P required to hold

Explain why the observation of alpha particles scattered at very large angles led Rutherford to reject Thomson's model of the atom and to propose a nuclear model. Match the words in the left column to the appropriate blanks in the sentences on the right. were in fact the decay products of matter. rotated around particles in orbits like satellites
Explain why the observation of alpha particles

why we get cold so much quicker moving through water than moving through air even when the temperature of the water and the air is the same. how a wet suit helps to reduce heat loss in water so that the core body temperature can be maintained.

space vehicle accelerates uniformly from 8 0 m / sm / s at tt = 0 to 1 6 4 m / sm / s at tt = 1 0 . 0 ss . How far did it move between tt = 2 . 0 ss and tt = 6 . 0 ss ? How far did it move between tt = 2 . 0 ss and tt = 6 . 0 ss ?

A soccer player, with a mass of 8 0 . 0 kg , slides on the ground to celebrate a goal. At the start of the slide, the player moves at a speed of 4 . 4 0 m / s before coming to rest. The coefficient of friction between the player and the ground is 0 . 7 0 0 . ( a ) Find the change in mechanical energy of the player ( in J ) from the start of the

Two 1 . 7 0 cmcm 1 . 7 0 cmcm plates that form a parallel - plate capacitor are charged to 0 . 7 1 4 nCnC . Part A What is the potential difference across the capacitor if the spacing between the plates is 1 . 2 0 mmmm ? Express your answer with the appropriate units. View Available Hint ( s ) for Part A Activate to select the appropriates

large meteorite of mass m strikes the Earth. It hits with a velocity perpen - dicular to the ground. It causes the Earth to start spinning slightly slower such that each day is slightly longer. Assume that the Earth is a solid sphere of radius R and mass M , with uniform density. ( a ) If each day before impact lasts exactly d = 2 4 hr , find the

Suppose that a heavy person and a light person are balanced on a teeter - totter made of a plank of wood. Each person now moves in toward the fulcrum a distance of 2 5 cm . What effect will this have on the balance of the teeter - totter?

what is the max velocity of a rocket with a c 6 - 5 engine

b ) Consider the Burgers equation u t + ? x - a u = 0 Use the Tanh Method to find its solution with traveling wave solution = k ( x - V t )
b ) Consider the Burgers equation u t + ? x - a u

An electron moves in a uniform electric and magnetic field given by , B = B , V / m * and B = Bo 2 . At time t = 0 lies at the a position x = tox and having a velocity

Problem 3 : Calculate the energy changes when the electron transitions from the n = 1 to the n = 4 state for the following ions.Part ( a ) Singly ionized helium, He + He + . Part ( b ) Doubly ionized lithium, Li + + Part ( c ) Triply ionized beryllium, Be + + +

What angle in radians is subtended by an arc of 1 . 4 0 m in length on the circumference of a circle of radius 2 . 4 5 m ? Express your answer in radians. Activate to select the appropriates template from the following choices. Operate up and down arrow for selection and press enter to choose the input value type Activate to select the

A need to take larger and larger doses of sleeping pills to avoid insomnia is an indication of

Which of the following statements is false regarding angular motion? Group of answer choices Angular motion refers to rotation about a fixed point An increase in the radius of rotation will increase linear distance traveled An decrease in the radius of rotation will increase linear distance traveled Angular position is commonly expressed in

( 3 pts ) Two coherent sources S 1 and S 2 emit waves with frequency f = 3 0 0 H z in a medium with wave speed c = 6 . 0 m s . In the configuration shown below, point P is on a nodal line, 1 5 cm away from S 2 . Now suppose that source S 2 is moved along the dashed diagonal line, for what positions of S 2 will P now be on an antinodal line? i . ,
( 3 pts ) Two coherent sources S 1 and S 2 emit

A cylinder contains oxygen at a pressure of 2 . 0 0 atmatm. The volume is 4 . 0 0 LL , and the temperature is 3 0 0 KK . Assume that the oxygen may be treated as an ideal gas. The oxygen is carried through the following processes: ( i ) Heated at constant pressure from the initial state ( state 1 ) to state 2 , which has T = 4 5 0 KT = 4 5 0 K . (

energetics of elementary steps

What volume of water has the same mass as 6 . 5 m 3 of gasoline, which has a density of 6 8 0 kg / m 3 ? Vwater = m 3 ( b ) If this volume of water completely fills a cubic tank, what is the pressure at the bottom? Pbottom = Pa ( c ) What force would the water pressure exert on the bottom of the cubic tank?

if the 8 0 0 kg and 5 0 0 kg masses in part a are fixed in place then what is the smallest speed that the 2 0 0 kg mass must be given to escape the gravitaional pull of the other 2 masses?

A uniform magnetic field is applied to a circular loop wire with a radius of 5 . 0 cm and a resistance of 0 . 2 0 in a direction perpendicular to the plane formed by the circular loop. If the strength of the magnetic field changes with time in the form B = 5 . 0 e - t T , how many mA is the current induced in this circular wire at t = 2 . 0 s ? (

At time t 0 , a localized magnetic field is detected at 3 . 2 3 , 4 . 6 2 , 0 m , with a direction B ^ = 0 . 7 1 2 8 , 0 . 7 0 1 4 , 0 . A short time later, this localized magnetic field is detected at 5 . 3 8 , 4 . 1 3 , 0 m . It is determined that this magnetic field is due to passing electromagnetic radiation. A . What is k ^ , the direction of

An electron and a proton have the same de Broglie wavelength. ( a ) How does the momentum of the proton compare to the momentum of the electron?

( 3 pts ) A laser beam passes through a 0 . 0 5 0 0 - m m slit, and the resulting diffraction pattern is viewed on a screen 2 . 2 0 m from the slit. The distance between adjacent n = 1 and n = 2 dark fringes is 2 0 . 0 mm . The screen is far enough away, and the fringes close enough together to justify the small - angle approximation. What is the
( 3 pts ) A laser beam passes through a 0 . 0 5 0

Question 1 4 pts 1 1 . The velocity at any time t of a simple harmonic oscillator is given by: v ( t ) = - 2 . 0 8 s i n ( 1 7 . 2 t ) , where v is in m s and t in sec . The position in meters ) of the mass at the time 5 3 seconds is: Hint: either set your calculator on radian or convert the phase into degrees.
Question 1 4 pts 1 1 . The velocity at any time t

Angular velocity is measured in units of cycles per second. True False

Problem 1 8 How much work is required to remove a dielectric slab with x = 1 0 from a parallel plate capacitor while its plates are connected to a 1 0 V battery. The area of each plate is 0 . 5 m 2 , the spacing between the two plates is 2 mm and the dielectric slab was initially filling all the space between the two plates. The mechanical
Problem 1 8 How much work is required to remove a

1 9 ) A space station of diameter 4 0 . meters is turning about its axis at a constant rate. What is the period 1 9 ) of revolution of the space station if the outer rim experiences an acceleration of 2 . 5 m / s~ ? A ) 1 0 . sB ) 1 3 . sC ) 1 4 . sD ) 1 8 . 5 E ) 1 1 . s

A train whistle of frequency 5 8 1 Hz sounds higher or lower in pitch depending on whether it approaches or recedes. Calculate the difference in frequency between the approaching and receding train whistle for a train moving at a speed of 1 5 9 k m h . Take the speed of sound in air to be 3 4 0 m s . Answer in units of Hz .
A train whistle of frequency 5 8 1 Hz sounds

Part A 1 0 0 mL of water at \ ( 2 0 . 0 ^ { \ circ } \ mathrm { C } \ ) is placed in the freezer compartment of a refrigerator with a coefficient of performance of 5 . 0 0 . How much heat energy is exhausted into the room as the water is changed to ice at \ ( - 5 . 0 0 ^ { \ circ } \ mathrm { C } \ ) ? Express your answer with the appropriate
Part A 1 0 0 mL of water at \ ( 2 0 . 0 ^ { \

1 5 Points Curling is a winter sport in which a heavy stone is slid along a sheet of ice toward a bull s eve house at the other end of the sheet. The coefficient of kinetic friction has been experimentally found to be

An RLC series circuit with R = 6 0 0 , L = 3 0 mH , and C = 0 . 0 5 0 F is driven by an ac source whose frequency and voltage amplitude are 5 0 0 Hz and 5 0 V , respectively. ( a ) What is the impedance of the circuit? ( b ) What is the amplitude of the current in the circuit? ( c ) What is the phase angle between the emf of the source and the

An object is suspended from a mass balance. When the object is surrounded by air, the mass balance reads 2 1 0 g . When the object is completely submerged in water, the mass balance reads 1 7 5 g . ( the density of water is 1 . 0 g c m 3 ) a ) What is the volume of the object ( in c m 3 ) ? b ) What is the density of the object ( in g c m 3 ) ?
An object is suspended from a mass balance. When

A uniform 1 0 - m - long 1 0 0 kg rod is at equilibrium is shown beloww. Force F is applied at end of rod and bar is perpendicular to the rod a ) determine the magnitude of torque from gravity b ) How big is F ? ( ) Determine friction force
A uniform 1 0 - m - long 1 0 0 kg rod is at

8 Formula 1 point USE WORKSHEET: Two parakeets sit on a swing with their combined center of mass 1 1 . 6 7 cm below the pivot. At t = 0 s the parakeets are at their maximum backwards position. At what time, in seconds, do the parakeets first reach their maximum forward position? Type your answer...
8 Formula 1 point USE WORKSHEET: Two parakeets

Question 5 3 The peak of each individual sine wave is called the frequency crest trough valley
Question 5 3 The peak of each individual sine

Q 4 ) The graph above shows the refractive index change of a material in different frequency regimes. Is this normal or anomalous dispersion? Explain why.
Q 4 ) The graph above shows the refractive index

Consider triple thin lenses f 1 , f 2 , f 3 system, where two are converging lenses and the other is diverging. When we combine all three lenses, we have d o = 9 c m and d i = 7 c m to form a clear image: In this problem, answers must be rational numbers. ( a ) Find the total focal length of this three - lenses ( f 1 , f 2 , f 3 ) system. ( b )
Consider triple thin lenses f 1 , f 2 , f 3

Question 8 ( 1 2 . 5 points ) A small bulb is rated at 7 . 5 W when operated at 1 2 5 V . Its resistance ( in ohms ) is 9 4 0 7 . 5 . 4 5 2 1 0 0 1 7
Question 8 ( 1 2 . 5 points ) A small bulb is

How much work must be done to increase the speed of an electron from ( a ) 0 . 1 5 c to 0 . 1 8 c and ( b ) from 0 . 9 2 c to 0 . 9 5 c ? Note that the speed increase is 0 . 0 3 c in both cases.

The resonance frequency of a series RLC circuit is 5 0 0 0 Hz . What is the resonance frequency if the peak emf E 0 is doubled?

An outer wall of a building has a height of 3 m and a width of 1 4 . 5 m . It consists of a layer of drywall with an R - factor of 0 . 5 2 , a fiberglass layer that is 3 . 5 inches thick with an R - factor of 1 1 , and a layer of insulated siding with an R - factor of 2 . 6 . The wall is built so well that there are no leaks of air through it .

Consiter a mass attached to a spring undergoing simple harmonic motion. At what istance from its equilibrium position does it experience minimum acceleration. A is the amplitule of the oscillator: A / 2 A A / 4 .
Consiter a mass attached to a spring undergoing

Things around you are emitting infrared radiation that includes the wavelength 9 . 9 \ times 1 0 - 6 m . What is the energy of these IR photons?

A string fixed at both ends is 8 . 1 m long and has a mass of 0 . 2 0 kg . It is subjected to a tension of 1 2 0 N and set oscillating. ( a ) What is the speed of the waves on the string? ( b ) What is the longest possible wavelength for a wave? ( c ) Give the frequency of that wave.

Suppose that a resistance connected between the tops of the tracks. What is the acceleration of the falling rod now: greater, smaller, or equal to g ?
Suppose that a resistance connected between the

If a photon of wavelength of 5 2 5 nm hits metallic cesium ( work function 3 . 4 3 x 1 0 - 1 9 J ) what is the velocity of the photoelectron produced?

8 . You take your 4 kg cat ice skating. Cats dont like ice, so it sits on a stationary ( and frictionless ) 1 5 kg sled. The cat notices another identical sled nearby and jumps onto it with a velocity of 2 m / s relative to the ice. Then, the cat changes its mind and jumps back to the first sled with a velocity of 2 m / s relative to the ice ( but

The four particles shown below are connected by rigid rods of negligible mass where y 1 = 6 . 4 0 m . The origin is at the center of the rectangle. The system rotates in the xy plane about the z axis with an angular speed of 6 . 5 0 rad / s . Four particles connected by rigid rods in the shape of a rectangle are shown. It lies on an x y -

A sound wave in air has a frequency of 5 0 0 Hz and a wavelength of 0 . 6 8 m . What is the air temperature? a . 1 8 C b . 0 C c . 1 5 C d . 2 7 C

Three positive charges and one negative charge are placed on the cor - ners of a square with side length a , as shown in the Figure 2 . Assume V ( ) = 0 . Figure 2 : Charges arranged in a square. ( a ) What is the net force on the negative charge? ( b ) What is the total stored electrostatic energy in this system? Ex - plain the sign of your
Three positive charges and one negative charge

When an electron trapped in a one - dimensional box transitions from its n = 2 state to its n = 1 state, a photon with a wavelength of 6 4 4 . 7 nm is emitted. What is the length of the box ( in nm ) ?

Each edge of a cubic container has a length of 0 . 1 4 m . Inside the sealed container, there are 0 . 7 2 5 mol of nitrogen gas at a temperature of 2 5 . 0 C . - Part ( a ) What is the volume, V , in liters, of the container? V = 2 . 7 4 4 Correct ! Part ( b ) Determine the magnitude, in newtons, of the net force that is exerted on one wall of the

A highly motivated Einsteinium DeGroot swings on a vine to rescue a hot babe from an unspeakable death, scooping her into his arm at the bottom of his swing and taking her up to safety on a ledge. DeGroot, being a college professor with some knowledge of physics, calculated whether the maneuver was possible before he attempted it a calculation you

Light of wavelength 1 . 2 2 nm creates a first order interference maximum when it is incident on a crystal at a grazing angle of 3 2 . 9 from the surface. Determine the interatomic spacing of the Bragg planes of the crystal. Answer in nanometers.

Boat A is traveling forward ( in positive y ) with a velocity of 2 5 m / s and an acceleration of 4 m / s 2 . The person in dingy B is traveling in a circle ( as they only have one oar ) . They have a forward ( in positive y ) velocity of 5 m / s and acceleration of - 1 m / s 2 ( as they have lost focus while watching boat A ) . The radius of

A particle moves along a horizontal straight line with a velocity v = M ^ 2 - 6 i m ' s . If a is initially located at the origin ( at 1 0 ) determine ( 1 ) The displacement and ( ii ) the distance travelled during the time interval 0 to 3 . 5 s . Find also the average velocity and the average speed of the particle during this time Interval [ ANS

The sun subtends an angle of about 0 . 5 degrees ( accidentally , the moon, being much closer, subtends the same angle; traditionally, known as "a quarter coin at average arm's length" ) , Using the fact that the sun is at 1 5 0 , 0 0 0 , 0 0 0 km from Earth, find it's approximate diameter. Question 6 options: 2 . 6 X 1 0 ^ 6 km 0 . 6 5 X 1 0 ^ 6

A space mission to visit the Earth's moon passes a point along the way where the Moon's gravitational field becomes stronger than the Earth's gravity. How far from the Earth is that point, expressed as a fraction of the average radius of the Moon's orbit?

what is the thinnest soap film that appears black when illuminated with light with a wavelength of 4 6 5 nm

What is the ratio of density of the nucleus to that of wate?

Photoelectron emission spectroscopies are surface - selective because: the photons do not have enough energy to penetrate into the solid beyond the surface these techniques are only surface selective if a grazing angle is used for the incoming photon beam photons can never penetrate into a solid material regardless of their energy photons

What if a proton, rather than an electron, moves in a direction perpendicular to the same magnetic field with this same linear speed? Will the radius of its orbit be different? Will the direction of rotation be different? The mass of the proton is 1 . 6 7 1 0 - 2 7 kg , and its charge is 1 . 6 1 0 - 1 9 C .

When the current in a toroidal solenoid is changing at a rate of 0 . 0 2 6 0 A / s , the magnitude of the induced emf is 1 3 . 0 mV . When the current equals 1 . 5 0 A , the average flux through each turn of the solenoid is 0 . 0 0 2 7 8 Wb . How many turns does the solenoid have?

1 . ( 1 0 points ) The current density in a cylindrical wire is given as 5 . 8 9 1 0 6 A / m 2 . Find the current in the wire if its diameter is 1 . 8 0 mm .

An electromagnetic wave with apesk magnetic field magnitude of 1 . 5 0 x 1 0 ^ - 7 T had an aeepcoarer peak electric field of what magnitude?

Two point charges are stationary and separated by a distance R . Which one of the following pairs of charges would result in the largest repulsive force? 3 q and - q 3 q and 2 q + 3 q and - 2 q + 2 q and + 4 q 2 q and + 4 q

as the heavier bucket moves downward to the groud, what will have been teh change in mechanical energy of a system consisting of the lighter bucker and the earth, and what will have been the tension in teh rope?

If 6 1 . 5 moles of an ideal gas occupies . 0 1 0 5 cubic meters at 5 6 . 5 degress celsius what is the pressure

A 3 . 0 mmmm - diameter copper wire carries a 3 8 AA current ( uniform across its cross section ) .

What is the force exerted by rope 1 on block I when the elevator is traveling upward at a constant speed of 2 . 0 m / s ?

To practice Problem - Solving Strategy 7 . 3 Conservation of energy with nonconservative forces. While a roofer is working on a roof that slants at = 3 6 . 0 degreesdegrees above the horizontal, he accidentally nudges his mm = 8 . 5 0 kgkg toolbox, causing it to start sliding downward, starting from rest. A frictional force of magnitude fkfk = 2 2

A spaceship leaves Earth traveling 0 . 6 9 c . A second spaceship leaves the first at a speed of 0 . 9 0 c with respect to the first. Calculate the speed of the second ship with respect to Earth if it is fired as follows. ( a ) in the same direction the first spaceship is already moving c ( b ) directly backward toward Earth

A protein molecule of mass 1 . 1 1 0 2 2 kg 1 0 2 2 kg and density 1 . 3 1 0 3 kg / m 3 1 0 3 kg / m 3 is placed in a vertical tube of water of density 1 0 0 0 kg / m 3 kg / m 3

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