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Physics Questions and Answers October 24, 2019

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A positively charged object is placed in a uniform electric field. Assuming the object is subject only to an electric force due to the field, the object will not accelerate. accelerate in the opposite direction of the electric field. accelerate in the same direction as the electric field. accelerate in a direction perpendicular to the electric
A positively charged object is placed in a

Part C: Electric field and Interactive Physics m = 7 5 g q = 8 C Theoretical: Find T and E if the apparatus were set up on the Mas
Part C: Electric field and Interactive Physics m

A laser beam of wavelength = 6 3 2 . 8 n m shines at normal incidence on the reflective side of a compact disc. The tracks of tiny pits in which information is coded onto the CD are 1 . 6 0 m apart.
A laser beam of wavelength = 6 3 2 . 8 n m shines

To better characterize the electron in a quantum mechanical model, Erwin Schr dinger introduced the equation: H = E . In this equation represents a ( n
To better characterize the electron in a quantum

The speed of light in material A is 1 . 4 times as large as it is in material B . of the refractive indices, nA / nB , of these materials?

Part 2 : Total Internal Reflection When light enters a medium with a lower index of refraction than the medium it is leaving, it bends away from the normal. Whenever s i n 1 n 2 n 1 , the light cannot enter the second medium. This is called total internal reflection. The smallest angle of incidence that has total internal reflection is called the
Part 2 : Total Internal Reflection When light

Part D If the air instead expands from state a to state c by the straight - line path shown, how much heat does it exchange with its surroundings? Figure 1 of 1 Express your answer in joules. Q a c = Previous Answers Request Answer Incorrect; Try Again; 3 attempts remaining
Part D If the air instead expands from state a to

Question 4 ( Mandatory ) ( 2 0 points ) A renegade Klingon spaceship evades detection with its cloaking device while passing close to Earth at a velocity of 0 . 3 0 c . The Klingons are bewildered while observing activities in a large stadium where 2 5 humans chase a truncated icosahedro around a grassy rectangular field. They pass directly over
Question 4 ( Mandatory ) ( 2 0 points ) A

0 0 : 3 7 1 6 Results A single - slit diffraction pattern is formed on a distant screen. Assuming the angles involved are small, by what factor will the width of the central bright spot on the screen change if the slit width is doubled? A . It will be cut to one - quarter its original size. B . It will be cut in half. C . It will double. D . It
0 0 : 3 7 1 6 Results A single - slit diffraction

Soccer players on the same team all have about the same energy needs. Group of answer choices True False

Which Carnot engine will convert more heat into work? ( i ) cold reservoir at 3 0 0 K and hot reservoir at 6 0 0 K ( ii ) cold reservoir at 3 0 0 K and hot reservoir at 9 0 0

When a 3 1 0 - gg piece of iron at 1 7 0 C C is placed in a 9 5 - gg aluminum calorimeter cup containing 2 5 0 gg of liquid at 1 0 C C , the final temperature is observed to be 3 9 C C . The value of specific heat for iron is 4 5 0 J / kg C J / kg C , and for aluminum is 9 0 0 J / kg C J / kg C . Part A Determine the specific heat of the liquid.

What is the vector product between two vectors?

A straight wire with a current placed in a uniform magnetic field experiences a force that is _ _ _ _ _ _ _ _ _ _ _ _ _ _ .

1 a 2 . Is the expression 2 x v = via - 1 2 dimensionally correct, where x is distance, a acceleration, y A . Yes B . Ne C . There is not enough information.
1 a 2 . Is the expression 2 x v = via - 1 2

Problem 3 ( . . . . / 1 3 pts ) b ) A particle has charge q - 1 C and mass m - 1 0 0 g . It has an initial velocity of & = 4 . 0 7 m / s and a commo acceleration a = ( 2 0 m / s * in a region in which uniform electric fields and magnetic fields are presen IF B = 3 TE , find the electric field . ( / 5 pts ) 2 - 0 2 : 0 AU AV = - 9 0 Watectrie force

It is found that there is a net electric flux of 7 . 9 1 0 4 N m 2 / C inward through a spherical surface of radius 6 . 9 cm

A merry - go - round spins freely when Janice moves quickly to the center along a radius of the merry - go - round. It is true to say that

GivenC = 3 F , Q = 2 6 C , R = 3 0 0 k , and o = 8 . 8 5 4 1 9 1 0 1 2 C 2 / N m 2 , at what 0 rate is the electric flux between the plates changing at time t = 0 . 1 2 s ? Answer in units of Vm / s .

find the time t that it takes for the current through the resistor to drop to 1 0 % of its value when the switch is opened

determine the contribution to resistivity due to Umklapp processes at

Part A What is the wavelength of a 1 . 2 MHz ultrasound wave traveling through aluminum? Express your answer with the appropriate units. View Available Hint ( s )
Part A What is the wavelength of a 1 . 2 MHz

A 3 2 . 8 kg box initially at rest is pushed 5 . 5 m along a rough, horizontal floor with a constant applied horizontal force of 1 2 6 . 7 N . The coefficient of friction between box and floor is 0 . 0 5 2 . Find the work done by the gravitational force. Input your answer to the nearest Joule. Use g = 9 . 8 m / s 2 . Your Answer:

A train traveling at 2 7 m / s approaches a person on the platform. After passing the person, the engineer blows the train's whistle at 8 7 2 Hz . What frequency in Hz does the person on the platform hear? The speed of sound is 3 4 0 m / s .

A cube of wood having an edge dimension of 2 0 . 3 cm and a density of 6 4 7 kg / m 3 floats on water. ( a ) What is the distance ( in cm ) from the horizontal top surface of the cube to the water level? Use Archimedes' principle to find the volume of the cube that is submerged and then from that result find the height of the cube's top surface

A solenoid 0 , 2 m long has 1 0 0 0 turns of wire and is oriented with its axis parallel to the earth's magnetic field at a place where the latter is 2 4 MT . What should be the current in the solenoid be in order that the field exactly cancel the earth's filed inside the solenoid?

A 2 . 3 0 - mmmm - diameter glass sphere has a charge of + 1 . 7 0 nCnC .

the direction of an induced emf ( or induced current ) is such that the induced magnetic field created by the induced emf opposes the change in the original magnetic flux that creates the induced emf.Group of answer choices

A 3 2 0 kg roller coaster cart with no friction descends at 4 m / s from a height of 9 . 5 m . If it reaches the bottom and climbs back up , what would the cart's speed be at a height of 7 m ?

All of the following statements are correct about elastic collision except Question 2 1 options: Momentum and kinetic energy are both conserved Interacting objects bounce off one another After interaction, the objects remain attached to one another Total momentum before and after the collision stays the same

Three polarizing filters are stacked, with the polarizing axis of the second and third filters at angles of 2 9 . 0 and 5 9 . 0 , respectively, to that of the first. If unpolarized light is incident on the stack, the light has an intensity of 5 3 . 0 W / cm 2 W / cm 2 after it passes through the stack.

The rms speed of an O 2 molecule is 5 0 0 m / s in a gas cylinder. If the pressure and volume of O 2 are kept constant, and the number of O 2 molecules is tripled, what is the final rms speed of the O 2 molecules?

A skateboarder travels on a horizontal surface with an initial velocity of 3 . 8 m / s toward the south and a constant acceleration of toward the east. Let the x direction be eastward and the y direction be northward, and let the skateboarder be at the origin at . ( a ) What are her x and y positions at ? ( b ) What are her x and y velocity

What net external force ( in N ) is exerted on a 1 2 5 0 - kg artillery shell fired from a battleship if the shell is accelerated at 2 . 6 0 1 0 4 m / s 2 ? ( Enter the magnitude. ) N What is the magnitude ( in N ) of the force exerted on the ship by the artillery shell? N

A child pulls on a wagon with a force of 7 5 N If the wagon moves a total of 4 2 n in 3 . 1 min, what is the average power delivered by the child? A . 1 7 W B . 2 1 W C . 2 2 W D . 2 6 W 6 . 8 m / s C . 1 . 4 m / s D . 9 . 2 m / s

A traveling wave propagates according to the expression y = ( 4 . 0 8 cm ) sin [ ( 2 . 4 5 cm 1 ) x ( 3 . 8 7 s 1 ) t ] , where x is in centimeters, and t is in seconds. Determine the amplitude of the wave. Answer in units of cm .

Light is reflected off the rear windshield of a car, as in the last question. At what position of the polarizer is the transmitted intensity at a minimum, and why? Light is reflected off the rear windshield of a car, as in the last question. At what position of the polarizer is the transmitted intensity at a minimum, and why? 9 0 0 and 2 7 0 0 ,

two radio antenna emit coherent electromagnetic waves that have wavelength 4 m point p is 8 . 0 0 m from one antenna and 6 m from the other antenna is the interference at point p constructive or destructive

What is the best coefficient of performance for a heat pump that has a hot reservoir temperature of 5 6 . 0 C and a cold reservoir temperature of - 2 2 . 0 C ? ( b ) How much heat transfer ( in kcal ) occurs into the warm environment if 3 . 6 0 1 0 7 J of work ( 1 0 . 0 kW h ) is put into it ? kcal ( c ) If the cost of this work input is 1 0 / kW

In the circuit shown in the figure ( Figure 1 ) , the 6 . 0 resistor is consuming energy at a rate of 2 1 J / s when the current through it flows as shown. Figure 1 of 1 Part A Find the current through the ammeter A . Express your answer with the appropriate units. Activate to select the appropriates template from the following choices. Operate up

A sprinter crosses the finish line of a race. The roar of the crowd in front approaches her at a speed of 3 5 6 m / sm / s . The roar from the crowd behind her approaches at 3 3 6 m / sm / s . Part A What is the speed of the sound? Express your answer with the appropriate units. Activate to select the appropriates template from the following

A 2 . 9 4 kg particle has a velocity of ( 2 . 9 4 - 4 . 0 7 ) m / s . ( a ) Find its x and y components of momentum. px = kg m / s py = kg m / s ( b ) Find the magnitude and direction of its momentum. kg m / s ( clockwise from the + x axis )

An oil film ) of thickness 2 0 5 nm floating on water is illuminated with white light at normal incidence. What is the wavelength of the dominant color in the reflected visible light?
An oil film ) of thickness 2 0 5 nm floating on

Pascal's Principle states that pressure applied to a confined liquid is transmitted without loss throughout the entire liquid to all inner surfaces of the liquid's container is illustrated b
Pascal's Principle states that pressure applied

A 1 2 cmcm - diameter circular loop of wire is placed in a 0 . 7 0 TT magnetic field.

The wavelensth of the wave in problem 1 ) is given approximately by a ) 0 . 2 m b ) 0 . 8 m c ) 1 . 1 m d ) 1 . 3 m e ) 1 . 5 m The masnetic feild component of the EM plane wave is problem 1 ) oscillates along the: a ) x - axis, with B y = B 2 = 0 b ) y - axis, with B x = B 2 = 0 c ) 2 - axis, with B y = B x = 0
The wavelensth of the wave in problem 1 ) is

The x component of velocity at point D is q , the x component of velocity at point A . a . greater than b . less than c . equal to d . unable to be compared to e . none of the above complete the statement correctly.
The x component of velocity at point D is q , the

P 6 : A wave packet is constructed at t = 0 by superposing waves, their wavelengths varying continuously in the following way y ( x , t ) = A ( k ) c o s ( k x ) d k Where A ( k ) = A for ( k 0 - k 2 ) k s ( k 0 + k 2 ) and = 0 otherwise. Sketch approximately y ( x , t ) and estimate x by taking the difference between two values of x for which the
P 6 : A wave packet is constructed at t = 0 by

A person of mass m p = 5 5 k g climbs up a 5 meter long ladder which leans against a vertical wall. The ladder has mass m l = 1 8 k g is placed at an angle = 7 3 above the ground. The coefficient of friction between the ladder and wall / ground is = 0 . 7 3 . a ) Draw a free body diagram of the ladder b ) write out three Newtons laws F x F y and z
A person of mass m p = 5 5 k g climbs up a 5

A musical note on a piano string has 1 0 points a frequency of 2 0 Hz . If the tension in the string is 1 0 0 N , and the wavelength is 2 m , what is the linear mass density of the wire?
A musical note on a piano string has 1 0 points a

Question 6 A large, open tank is filled to a height \ ( h \ ) with liquid of density \ ( p \ ) . What is the speed of the liquid emerging from a small hole at the base of the tank? ( 1 0 pts )
Question 6 A large, open tank is filled to a

A 1 2 - c m - long thin rod has the nonuniform charge density | ) / ( 6 . 0 c m | ) , where x is measured from the center of the rod. Part A What is the total charge on the rod? Hint: This exercise requires an integration. Think abouthow to handle the absolute value sign. Express your answer with the appropriate units. Q =
A 1 2 - c m - long thin rod has the nonuniform

A physical pendulum is formed by a two - part structure. One part is a thin uniform rod of mass 0 . 5 0 kg which is free to swing about an axis at one end. The axis of rotation is perpendicular to the plane of the rod's swing. The second part of the structure is a small mass located at the free end of the rod ( further from the axis ) , which has
A physical pendulum is formed by a two - part

A cylinder has a length L and a radius R , and carries a charge density of . Find the potential on the axis of symmetry a distance z from the center. Then calculate E at a distance z > L 2 .
A cylinder has a length L and a radius R , and

Chapter 2 Homework ractice Problem 2 . 1 1 Review I Constants
Chapter 2 Homework ractice Problem 2 . 1 1 Review

A turbine steam engine q , makes steam generates electricity extracts thermal energy from nuclear sources uses the electromagnetic induction method to extract energy
A turbine steam engine q , makes steam generates

Scores eText Study Area Document Sharing User Settings Request Answer Incorrect; Try Again; 5 attempts remaining 0 A l Study Tools Looking for some guidance? Let's work through a few related practice questions before you g o back t o the real thing. This won't impact your score, s o stop a t anytime and ask for clarification whenever you need i t
Scores eText Study Area Document Sharing User

What is the relationship between force and motion? Frore causes motion to start, stop, or change. Force couses motion, but motion stops on its own. Motion causes forres to act on objects. Force and motion do not have a relationship
What is the relationship between force and

An object has a position given by vec ( r ) = [ 2 . 0 m + ( 1 0 . 0 m s ) t ] h a t ( i ) + [ 8 . 0 ( m ) - ( 3 . 8 0 m s 2 ) t 2 ] h a t ( i ) , where quantities are in SI units. a ) What is the velocity of the object as a function for time? b ) What is the acceleration of the object as a function for time? c ) What is the speed of the object at
An object has a position given by vec ( r ) = [ 2

How much potential energy would an electron in a hydrogen atom lose if it fell toward the nucleus from a distance of 7 . 5 1 0 - 1 1 m to a distance of 5 . 0 1 0 - 1 1 m ?
How much potential energy would an electron in a

Two Balls and a Thin Rod Puntos: 2 0 Two balls of mass 3 . 0 9 kg are attached to the ends of a thin rod of negligible mass and length 6 9 cm . The rod is free to rotate without friction about a horizontal axis through its center. A putty wad of mass 1 3 7 g drops onto one of the balls, with a speed 2 . 3 m s , and sticks to it . What is the
Two Balls and a Thin Rod Puntos: 2 0 Two balls of

Part A A 1 0 9 A current circulates around a 1 . 7 0 - mm - diameter superconducting ring. What is the ring's magnetic dipole moment? Express your answer in amperes times meter squared. View Available Hint ( s ) Previous Answers Correct Part B What is the on - axis magnetic field strength 5 . 0 0 cm from the ring? Express your answer with the
Part A A 1 0 9 A current circulates around a 1 .

A student standing on a cliff that is a vertical height d = 1 8 0 . 0 m above the level ground throws a stone with velocity v 0 = 4 m s horizontally
A student standing on a cliff that is a vertical

What magnitude point charge creates a 1 2 , 0 0 0 N / C electric field at a distance of 0 . 2 5 0 m ? b ) How large is the field at 1 2 m ?

will a changing electric field always induce a magnetic field

Estimate the distance to a galaxy whose redshift indicates that it is moving away from us at a speed of 2 2 , 0 0 0 km / s . Assume that Hubble s constant is 2 2 km / s / Mly gh

A convex mirror has a radius of curvature equal to 1 0 cm . What is its focal length? + 5 c m - 5 c m - 1 0 c m + 1 0 c m
A convex mirror has a radius of curvature equal

Which of the following wavelengths will elect photoelectrons from a metal surface with a workfunction of 2 . 0 eV ? Question 4 options: 7 2 5 nm 6 2 7 nm 8 2 5 nm none of these wavelengths will produce photoelectrons

According to Einstein, the amount of energy needed to bring a mass m to the speed of light c is infinite impossible to determine because of quantum entanglement less than zero determined by the distance it must travel given by the mass times the speed of light, squared! ( = mc ^ 2 )

( 5 pts ) 1 3 . Five moles of an ideal gas are cooled at constant pressure from a temperature of 1 2 7 . 0 C to 4 7 . 0 C . What is the work W done by the gas during this process? ( a ) - 8 . 2 1 0 ^ 3 J ( b ) + 8 . 2 1 0 ^ 3 J ( c ) - 5 . 0 1 0 3 J ( d ) + 5 . 0 1 0 3 J ( e ) - 3 . 3 1 0 3 J ( f ) + 3 . 3 1 0 J ( g ) none of the above answers

True or false: the entropy of a fixed amount of an ideal gas increases in every isothermal compression

red laser had absolutely no effect on the solar panels so he built an even bigger, 5 0 0 0 W red laser. Do you expect this brighter laser to create an electric current in the solar panels? Briefly explain why or why not

Two wires, A and B , are made of the same metal and have equal length, but the resistance of wire A is four times the resistance of wire b . which wute has creater diameter?

The world's longest suspension bridge is the Akashi Kaikyo Bridge in Japan. The bridge is 3 9 1 0 m 3 9 1 0 m long and is constructed of steel. How much longer is the bridge on a warm summer day ( 3 0 . 0 C 3 0 . 0 C ) than on a cold winter day ( 5 . 0 0 C ) ( 5 . 0 0 C ) ?

which of the following statements is true concerning the reading of weight on a scale. if you are standing on a scale while accelerating downward the scale will read.. A . there is not enough information to respond B . more than your weight as measures when you have zero acceleration relative to earth D . less than your weight measured when you

The isotope 6 4 Zn has a nuclear radius of 4 . 8 \ times 1 0 1 5 m . Approximately what is the nuclear radius of the isotope 2 7 Al ?

Certain experiments must be performed in the absence of any magnetic fields. Suppose such an experiment is located at the center of a large solenoid oriented so that a current of I = 2 . 2 0 Aproduces a magnetic field that exactly cancels Earth's 4 . 3 0 1 0 5 T magnetic field. Find the solenoid's number of turns per meter.

Suppose the maximum safe intensity of microwaves for human exposure is taken to be 1 . 0 0 W / m 2 1 . 0 0 W / m 2 . ( a ) If a radar unit leaks 1 0 . 0 W of microwaves ( other than those sent by its antenna ) uniformly in all directions, how far away must you be to be exposed to an intensity considered to be safe? Assume that the power spreads

Equipotential bonding means

A 6 0 - kg skier starts from rest from the top of a 5 0 - m high slope. If the work done by friction is - 6 . 0 kJ , what is the speed of the skier on reaching the bottom of the slope? A . 1 7 m / s B . 2 4 m / s C . 2 8 m / s D . 3 1 m / s C . 2 . 8 N D . 4 . 2 N

A tank of cross - sectional area is filled halfway with water. The tank has a small hole of cross - sectional area in its side near the base. The pressure at the top of the fluid is kept at , which is larger than atmospheric pressure. How much faster is the flow speed out, , compared to the rate of change of the fluid level in the tank, ?

A series RLC circuit with L = 2 5 mH , C = 0 . 8 F , and R = 7 is driven by a generator with a maximum emf of 1 2 V and a variable angular frequency . ( a ) At = 8 0 0 0 rad / sec the impedence of the circuit ( in ohms, ) , is 7 1 7 2 2 7 . 1 1 2 . 3 4 4 . 3 [ 1 0 points ] 0 attempt ( s ) made ( maximum allowed for credit = 1 ) ( b ) At = 8 0 0 0

he NAACP was formed to stop what?

Three resistors, each 6 0 , are connected in series to each other. The total current through this combination is 5 3 A . What is the current through each resistor? ( in units of Ampere )

If light or sound information coming from an object is "blue shifted" that means the object is

A force of 5 3 3 N keeps a certain spring stretched a distance of 0 . 4 0 0 m .

A tree contractor has been hired by a homeowner to remove a damaged tree from a previous storm. The top of the tree broke off, leaving the trunk in the ground. The arborist will remove the tree by attaching a rope near the top and cutting the base close to the ground. The scenario is shown in the figure. The distances in the figure are z = 1 2 . 9
A tree contractor has been hired by a homeowner

An automobile traveling at 7 9 . 5 km / h has tires of 7 5 . 0 cm diameter. What is the angular speed of the tires about their axles? Tries 0 / 1 5 If the car is brought to a stop uniformly in 3 2 . 0 complete turns of the tires ( without skidding ) , what is the magnitude of the angular acceleration of the wheels? Tries 0 / 1 5 How far does the

DRAW A FREE BOOY DIAGRAM FOR THE FGGURE BELOW. DETERMINE AND INCLUDE THE REACTION T A & B
DRAW A FREE BOOY DIAGRAM FOR THE FGGURE BELOW.

In the metric system, the unit of force is the Newton ( N ) . Write how the Newton is related to the basic units.
In the metric system, the unit of force is the

estion 1 5 5 Points unto de fusi n de la plata es 9 6 0 grados celsius y su calor espec fico es 0 . 0 5 6 c a l g . Su calor de fusi n es 2 1 . 1 c a l g . 1 0 5 0
estion 1 5 5 Points unto de fusi n de la plata es

A plum is located at coordinates ( - 1 . 4 9 m , 0 , 3 . 9 4 m ) . In unit - vector notation, what is the torque about the origin on the plum if that torque is due to a force vec ( F ) whose only component is ( a ) F x = 1 . 2 5 N , ( b ) F x = - 1 . 2 5 N , ( c ) F z = 1 . 2 5 N , and ( d ) F z = - 1 . 2 5 N ?
A plum is located at coordinates ( - 1 . 4 9 m ,

1 3 - Two conducting spheres one with a radius of 0 . 4 m and a charge of 2 0 nC and the other with a radius 0 . 6 m and a charge of 3 0 nC are 1 6 m apart center to center. a ) find the electric potential at the mid point between them b ) If the two spheres are connected using a very thin conductor, what is the charge on each
1 3 - Two conducting spheres one with a radius of

Three polarizing filters are stacked, with the polarizing axis of the second and third filters at angles of 2 2 . 8 and 6 2 . 0 , respectively, to that of the first. If unpolarized light is incident on the stack, the light has an intensity of 7 2 . 5 W c m 2 after it passes through the stack.
Three polarizing filters are stacked, with the

Question E 1 - 3 : Qualitatively compare the heat energy needed to melt one kilogram of ice with the heat energy needed to raise the temperature of one kilogram of water by one degree Celsius. ( Are they about the same, or is one much larger than the other? )
Question E 1 - 3 : Qualitatively compare the heat

Use your equation above to calculate B m a g at the N pole surface of your magnet. You will have to make a measurement of something to do this. ( ) . Explain what you had to measure and then do the calculation to estimate B m a g at the magnet's N pole. Ponder the distance dependence of the magnetic field. This dependence mimics ( approximately ,
Use your equation above to calculate B m a g at

What would the BEN in MeV be for a nucleus with 9 9 protons, 1 4 2 neutrons and an atomic mass of 2 2 9 . 1 u ?

What is the ( magnitude of the, force on a wire of length 0 . 1 meters carrying a current of 3 A , if the wire is parallel to a magnetic field of 0 . 3 T ?
What is the ( magnitude of the, force on a wire

If the speed of light through an unknown material is 1 9 6 , 9 5 7 , 3 8 8 m / s , what is the index of refraction? ( Speed of light in a vacuum = 3 1 0 8 m / s ) . Give your answer to three decimal places.

1 9 kgkg sphere is at the origin and a 1 2 kgkg sphere is at ( x , y ) = ( ( x , y ) = ( 2 2 cmcm , , 0 cm ) cm ) . Part A At what point or points could you place a small mass such that the net gravitational force on it due to the spheres is zero?

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