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Physics Questions and Answers September 11, 2019

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The Concorde was a supersonic aircraft used for trans - Atlantic travel in the 1 9 8 0 s and 1 9 9 0 s , having a length of 6 1 . 2 m when sitting on the ground on a typical day when the temperature is 1 7 . 0 C . The Concorde is primarily made of aluminum. In flight at twice the speed of sound, friction with the air warms the Concorde's skin and

Suppose you have a circuit containing a source and a capacitor, which has a 2 . 2 5 M reactance produced at the source frequency of 6 5 Hz .

A typical ten - pound car wheel has a moment of inertia of about 0 . 3 5 k g * m 2 . The wheel rotates about the axle at a constant angular speed making 4 5 . 0 full revolutions in a time interval of 3 . 0 0 s .
A typical ten - pound car wheel has a moment of

6 1 3 nm light is incident on a diffraction grating with 1 8 1 lines / mm . How many maxima are observed? [ Hint: Your answer should be an integer 1 . There is a central maximum at m = 0 followed by pairs on either side. ]

What property of matter is primarily in effect when unscrewing a bottle top? Friction Vector Force Torque
What property of matter is primarily in effect

Using the information below, find the absolute pressure, P 0 , of the ideal gas in the enclosed space. The fluid density is 1 0 0 0 kg / m 3 . Answer in Pa . = 1 0 0 kPa is the absolute pressure of the surroundings, L 1 = 8 0 cm , L 2 = 6 0 cm , A 1 = 1 m 2 , A 2 = 2 m 2 ( 1 0 0 0 pts )

A bat flies along the x axis. What is the sign of the acceleration if it is moving in the positive direction with a constant velocity?

An amount of argon gas ( considered ideal ) is expanding adiabatically. If the original volume is 2 9 7 L , the original pressure 9 . 9 4 E + 4 Pa , and the final volume 3 6 6 L , what is the final pressure? Type your answer here Pa

A guitar string is 9 0 . 0 cmcm long and has a mass of 3 . 2 4 gg . From the bridge to the support post ( = ) ( = ) is 6 0 . 0 cmcm and the string is under a tension of 5 3 6 NN . Part A What are the frequencies of the fundamental and first two overtones? Enter your answers numerically separated by commas. Activate to select the appropriates

A waterhole has enough water to last for 2 0 days for 8 0 animals. Calculate how long the water will last if a ) 2 0 more animals start drinking at the waterhole b ) 1 6 of the 8 0 animals starts drinking at another waterhole

Why is KE 0 in calculating max angle

A runner of mass 5 6 . 0 kg kg runs around the edge of a large horizontal turntable mounted on a vertical, frictionless axis through its center; i . e . i . e . a sturdy merry - go - round constructed of strong but lightweight materials and with a running track along its rim. His velocity relative to the Earth has magnitude of 3 . 2 0 m / s m / s

If the distance between two masses decreases by 2 , how many times will the gravitational force between them increase?

In normal lungs, the thickness of the membrane that surrounds an alveolar sac is 3 0 0 m .

The challenge associated with wind energy whose power output cannot be forecast in advance location storage predictability intermittency
The challenge associated with wind energy whose

Problem 1 : Sound travels at a speed of v = 1 5 3 0 m / s in water. While underwater. Student hears a f = 2 . 5 kHz note in a whale song. ( A ) Input an expression for the wavelength of the sound wave in water. ( B ) What is the wavelength in meters?

How fast would you have to travel so that to you the distance would be only 4 0 light - years?

Light from a helium - neon laser ( = 6 3 3 nmnm ) passes through a circular aperture and is observed on a screen 5 . 5 0 mm behind the aperture. The width of the central maximum is 1 . 4 0 cmcm . Part A What is the diameter ( in mmmm ) of the hole? Express your answer in millimeters. View Available Hint ( s ) for Part A Activate to select the

Barb caused water damage to an apartment she was renting when she inadvertently left water running in the bathtub. under 1 6 5 , you should inform her that

Chapter 1 3 : The Atomic Nucleus and Radioactivity Radioactivity - continued Draw in a decay - scheme diagram below, similar to Figure 1 3 . 1 7 in your text. In this case you begin at the upper right with U - 2 3 5 and end up with a different isotope of lead. Use the table at the left and identify each element in the series by its chemical
Chapter 1 3 : The Atomic Nucleus and

A ball of mass M is attached to a string. The ballis rotating with a velocity V in a circle of radius R . If the velocity of the ball is doubled, the centripetal force on the ball _ _ _ _ _ _ _ _

Using the ammeter with the probe, measure the current in the 2 5 resistor. What is the current? ( Enter your answer in A . ) A
Using the ammeter with the probe, measure the

During a certain period of time, the angular position of a swinging door is described by = 1 . 8 + 9 . 6 t + 1 . 1 t 2 , where is in radians and t is in seconds. Determine the angular speed at 1 . 4 s to one decimal place in radians / s .

The force per meter between the two wires of a jumper cable being used to start a stalled car is 0 . 2 6 N / m . What is the current in the wires, given they are separated by 2 . 0 0 cm ?

When the spring is oscillating and it is at its most compressed position ( all the way wp ) , what is the Velocity and Acceleration?
When the spring is oscillating and it is at its

please solve correctly. Thank you in advance.
please solve correctly. Thank you in advance.

B = 0 I 2 r = u 0 1 0 - 7 1 0 2 ( 7 ) + ( 3 ) = 1 . 2 6 1 0 - 5 4 6 . 9 8 = 2 . 6 8 1 0 - 7 T 1 1 - 1 2 . Two wires are in the shape of a plus sign. Each wire carries 1 0 A of current. What is the Total Magnetic field at point P ? ( : ( 5 . 5 4 1 0 - 4 ( T ) ) + 6 . 6 8 1 0 - 7 ( T )
B = 0 I 2 r = u 0 1 0 - 7 1 0 2 ( 7 ) + ( 3 ) = 1

A ball has a diameter of 3 . 7 8 cm and average density of 0 . 0 8 4 1 g c m 3 . What force is required to hold it completely submerged under water?
A ball has a diameter of 3 . 7 8 cm and average

\ table [ [ Two charged particles A and B carry a charge of + 2 q and - q respectively. ] , [ ( i ) What is the electric potential, V , at a distance x from the origin on the x - axis? ] , [ ( ii ) A third charged particle, C , carrying a charge of + q is placed at the x = 0
\ table [ [ Two charged particles A and B carry a

An object weighing 3 0 6 N in air is immersed in water after being tied to a string connected to a balance. The scale now reads 2 5 9 N . Immersed in oil, the object appears to weigh 2 9 1 N . ( a ) Find the density of the object. Your response differs significantly from the correct answer. Rework your solution from the beginning and check each

Blue and red laser beams propagate in the same direction inside the glass striking an air - glass interface . The glass has refractive indices of 1 . 6 9 0 and 1 . 6 1 6 for the blue and red light, respectively. Part A For what range of incidence angles on the glass - air interface will one beam be totally reflected and the other not? Express your

A circular loop of wire with a radius of 1 4 . 0 cm and oriented in the horizontal xy - plane is located in a region of uniform magnetic field. A field of 1 . 8 T is directed along the positive z - direction, which is upward. If the coil is viewed looking down on it from above, is the induced current in the loop clockwise or counterclockwise?

( 2 ) If a particle has an acceleration given by ( : 1 , e - t , s i n ( 2 t ) : ) , an initial position of ( : 0 , 0 , 2 : ) at t = 0 , and an initial velocity ( : 2 , 0 , 0 : ) , then find the speed of the particle when t = 1 .
( 2 ) If a particle has an acceleration given by

1 9 As an electron moves through a region of space, its speed decreases from 9 . 4 0 1 0 m s to 1 . 4 0 1 0 m s . The electric force is the only force acting on the electron. Problem 1 7 . 0 4 8 . a - Movement of electron Which of the following statements is correct about the movement of the electron? Multiple Choice The electron moves to a higher
1 9 As an electron moves through a region of

PRS - C 2 2 - & 2 3 - L 1 : Assuming WIMPs really exist and make up most of the dark matter in the universe, which of the following is not one of their characteristics? They travel at speeds extremely close to the speed of light. They could show gravitational lensing effects. They are frictionless particles as they don't emit thermal radiation.
PRS - C 2 2 - & 2 3 - L 1 : Assuming WIMPs really

A 3 7 kg child rides a relatively massless sled down a hill and then coasts along the flat section at the bottom, where a second child with a mass of 3 8 . 5 kg jumps on the sled as it passes by her. If the speed of the sled is \ ( 3 \ mathrm { ~m } / \ mathrm { s } \ ) before the second child jumps on , what is its speed after she jumps on ?
A 3 7 kg child rides a relatively massless sled

Particle - X has a speed of 0 . 8 8 0 c and a momentum of 9 . 8 3 0 1 0 - 1 9 kgm / s . What is the mass of the particle? Tries 0 / 2 0 What is the rest energy of the particle? Tries 0 / 2 0 What is the kinetic energy of the particle? Tries 0 / 2 0 What is the total energy of the particle?

The Sun's mass is 2 . 0 1 0 3 0 kg , its radius is 7 . 0 1 0 5 km , and it has a rotational period of approximately 2 8 days. If the Sun should collapse into a white dwarf of radius 7 . 7 1 0 3 km , what would its period ( in s ) be if no mass were ejected and a sphere of uniform density can model the Sun both before and after?

how much water will freeze after 4 . 5 kh of ice at - 2 2 is added to a large quanitity of water at 0

A fixed 1 3 . 7 - cm - diameter wire coil is perpendicular to a magnetic field 0 . 6 6 T pointing up . In 0 . 1 3 s , the field is changed to 0 . 2 7 T pointing down.

3 6 . Why is the following situation impossible? Imagine a copper wire with radius 1 . 0 0 mm encircling the Earth at its magnetic equator, where the field direction is horizontal. A power supply delivers 1 0 0 MW to the wire to maintain a current in it , in a direction such that the magnetic force from the Earth s magnetic field is upward. Due to

You exert a force of a known magnitude FF on a grocery cart of total mass mm . The force you exert on the cart points at an angle below the horizontal.

A piano wire with mass 3 . 2 0 gg and length 8 5 . 0 cmcm is stretched with a tension of 2 5 . 0 NN . A wave with frequency 1 1 5 HzHz and amplitude 1 . 7 0 mmmm travels along the wire.

A heat engine operates in a Carnot cycle between 6 4 . 1 C and 4 3 5 C . It absorbs 2 0 7 0 0 J of energy per cycle from the hot reservoir. The duration of each cycle is 0 . 8 s . What is the mechanical power output of this engine? Answer in units of kW . How much energy does it expel in each cycle by heat? Answer in units of kJ .

in the figure, a small 0 . 3 3 3 kg block slides down a frictionless surface through height = 0 . 6 6 9 m and then sticks to a uniform vertical rod of mass M = 0 . 6 6 6 kg and length d = 2 . 1 6 m . The rod pivots about point O through angle theta before momentarily stopping. Find theta

The Fermi energy of sodium is 3 . 2 3 eVeV. Part A Find the average energy EavEav of the electrons at absolute zero. Express your answer in electron volts. Part B What is the speed of an electron that has energy EavEav? Express your answer in meters per second. Part C At what Kelvin temperature TT is kTkT equal to EFEF? ( This is called the Fermi

2 . ( 8 pts . ) A coherent beam of light enters a liquid of refractive index 2 . 0 . What is the speed of light in this liquid?
2 . ( 8 pts . ) A coherent beam of light enters a

Find the magnitude of a uniform electric field ( in MV / m ) with the same energy density as a 1 . 3 1 - T magnetic field.

Where is the near point of an eye for which a contact lens with a power of + 2 . 8 0 diopters is prescribed?

Question 5 of 5 On a vacation, you are scuba diving in a fresh water lake and using a diving mask that has a face plate that bulges outward with a radius of curvature of 0 . 5 0 5 m . As a result, a convex spherical surface exists between the water and the air in the mask. A fish swims by you 2 . 5 7 m in front of your mask. How far d in front of
Question 5 of 5 On a vacation, you are scuba

A force F ( x ) = ( - 4 . 0 x 2 + 8 . 0 x ) N h a t ( i ) acts on a particle as it moves along the x - axis. Part ( a ) How much work, in joules, does the force do on the particle as it moves from x = 2 . 0 2 m to x = 5 . 1 1 m ? W = J Submit Hint Feedback Submission ( s ) Remaining Hints: 0 ? for a 0 % deduction. Hints remaining: 0 ? Feedback: 0
A force F ( x ) = ( - 4 . 0 x 2 + 8 . 0 x ) N h a

The bulbs have the following resistances ( Ohm ) : A = 5 , B = 3 , C = 6 . What is the total resistance of the circuit? Note that All resistance unit of A , B , & C is Ohm . 8 . 0 Ohm 5 . 3 Ohm 2 1 Ohm 0 . 5 Ohm 7 . 0 Ohm
The bulbs have the following resistances ( Ohm )

( 2 0 points ) Briefly answer the following conceptual questions: ( a ) ( 5 points ) Describe what the young lady from the painting " An Evening Out" by the Spanish artist Raimundo de Madrazo y Garreta sees when she holds a small mirror in front of herself while her back is leaning against a large plane mirror. ( b ) ( 5 points ) A point source
( 2 0 points ) Briefly answer the following

A 2 1 . 0 kgkg bucket of water is suspended by a very light rope wrapped around a solid uniform cylinder 0 . 3 0 0 mm in diameter with mass 1 3 . 0 kgkg . The cylinder pivots on a frictionless axle through its center. The bucket is released from rest at the top of a well and falls 1 0 . 2 mm to the water. While the bucket is falling, what is the

A contestant in a winter games event pushes a 3 4 . 0 kg block of ice across a frozen lake as shown in the figure. The coefficient of static friction is 0 . 1 and the coefficient of kinetic friction is 0 . 0 3 . ( a ) Calculate the minimum force F ( in N ) he must exert to get the block moving. N ( b ) What is its acceleration ( in m / / s ^ ( 2 )
A contestant in a winter games event pushes a 3 4

A garden hose with an internal diameter of 2 . 7 cm is connected to a stationary lawn sprinkeler that consist merely of a container with 2 2 holes each 0 . 3 8 cm in diameter if the water in the hose has a speed of 0 . 8 2 m / s at what speed does it leave the sprinkeler holes

Part B For the bar to be in rotational equilibrium, should I be in the direction from a to b or b to a ? Drag the terms on the left to the appropriate blanks on the right to complete the sentences. Reset Help the left b clockwise upward the right downward Gravity tends to rotate the bar about point a , so the magnetic force must be and to to tend
Part B For the bar to be in rotational

An object that completes 1 0 vibrations in 2 0 seconds has a frequency of A ) 0 . 5 hertz. B ) 2 hertz. C ) 2 0 0 hertz.
An object that completes 1 0 vibrations in 2 0

Planet \ ( X \ ) has twice Earth's mass and three times Earth's radius. The magnitude of the gravitational field near Planet X ' s surface is most nearly \ ( 2 \ mathrm { ~N } / \ mathrm { kg } \ ) 7 N / kg 1 0 N / kg 2 0 N / kg
Planet \ ( X \ ) has twice Earth's mass and three

A wire 5 0 cm long with an east - west orientation carries a current of 4 . 0 A eastward. There is a uniform magnetic field perpendicular to this wire. If the force on the wire is 0 . 4 0 N upward, what are the direction and magnitude of the magnetic field?
A wire 5 0 cm long with an east - west

Spinning neutron stars emit radio waves. x - rays. light waves. cosmic rays. microwaves.

the magnetic field in a solenoid is . a circular wire of radius cm is concentric with a solenoid of radius cm and length meter, containing turns. the current increases at a rae of

A solid spherical conductor ( radius = 2 mm ) has a uniform surface charge density. Point A is 5 mm from the center of the sphere, and point B is on the surface of the sphere. If the electric potential at point A is 4 1 V lower than at point B , what is the net charge on the sphere?What is the magnitude of the magnetic dipole moment of the bar

Unpolarized light of intensity 2 1 W / cm ^ 2 is incident on a linear polarizer set at the polarizing angle = 2 8 degrees . The emerging light then passes through a second polarizer that is set at the polarizing angle = 1 2 6 . Note that both polarizing angles are measured from the vertical. What is the intensity of the light that emerges from the

A physicist at a fireworks display times the lag between seeing an explosion and hearing its sound, and finds it to be 0 . 6 0 0 s . ( Enter your answers to at least four decimal places. Use the following relationship between Kelvin and Celsius: T ( K ) = T ( C ) + 2 7 3 . 1 5 . ) ( a ) How far away ( in m ) is the explosion if air temperature is

Find the speed of an electron moving in an arc of radius 0 . 1 0 m perpendicular to a magnetic field with a magnitude of 1 . 0 1 0 - 4 T .
Find the speed of an electron moving in an arc of

What is the approximate radius of an oxygen nucleus with 8 protons and 8 neutrons?

A thin metallic shell of radius 4 0 cm has a charge of - 2 5 nC on it . At the center of the sphere is a point charge of 3 5 nC . What is the electric field 5 0 cm from the center of the shell? Multiple Choice 4 0 0 N / C outward 5 6 0 N / C inward 3 6 0 N / C outward 3 6 0 N / C inward
A thin metallic shell of radius 4 0 cm has a

What is the approximate angular speed of a windmill spinning at the rate of 1 0 rev / s
What is the approximate angular speed of a

A ) ( 7 pts ) A conducting loop is pulled out of a magnetic field \ ( B _ { \ text { ext } } \ ) with velocity \ ( v \ ) . What is the direction of the induced current in the conducting loop? Show explanations.
A ) ( 7 pts ) A conducting loop is pulled out of

the amount of electrical energy that flows into the oventhe amount of electromagnetic energy ( microwaves ) that the oven generatesthe amount of heat the oven transfers to the environmentthe amount of heat added to the coffee

A cylinder of nitrogen and a cylinder of neon are at the same temperature and pressure. The mean free path of a nitrogen molecule is 1 9 0 nm . Part A What is the mean free path of a neon atom?

The relationship = / between momentum and wavelength applies to:

Do all parts Consider the situation illustrated below. Specifically, a particle with charge \ ( q \ ) and mass \ ( m \ ) enters a medium with a uniform magnetic field \ ( \ vec { B } \ ) . The initial velocity of the particle \ ( \ vec { u } \ ) is perpendicular to \ ( \ vec { B } \ ) , and the magnetic force exerted on the particle causes it to
Do all parts Consider the situation illustrated

A region of vacuum contains both a uniform electric field with magnitude EE and a uniform magnetic field with magnitude BB . If EE = 5 5 0 V / mV / m , what is BB , in teslas, if the magnetic - field and electric - field energy densities are equal?

A solid metal ball of radius 1 . 6 cm is located near a hollow plastic ball of radius 2 . 2 cm bearing a uniformly distributed charge of - 5 nC on its outer surface. The distance between the centers of the balls is 1 1 cm .

A hurricane wind blows across a 6 . 0 0 m 1 1 . 0 m 6 . 0 0 m 1 1 . 0 m flat roof at a speed of 1 1 0 km / hkm / h . Part A Is the air pressure above the roof higher or lower than the pressure inside the house? Explain. The pressure above the roof is higher due to the higher velocity of the air.The pressure above the roof is lower due to the lower

A 3 2 . 0 kg child takes a ride on a Ferris wheel that rotates four times each minute and has a diameter of 2 0 . 0 m . ( a ) What is the centripetal acceleration of the child? magnitude The child moves in a circle on the Ferris wheel. Calculate the centripetal acceleration for the circular motion. m / s 2 direction - - - Select - - - toward the

A mass M 0 is attached to a spring and hung vertically. The mass is raised a short distance in the vertical direction and released. The mass oscillates with a frequency F 0 . If the mass is replaced with a mass eight times as large, and the experiment was repeated, what would be the frequency of the oscillations in terms of F 0 ?

"the center of mass of a pitched baseball of radius 3 . 3 9 cm at 1 6 . 3 m / s . . . . spins about an axis... angular speed of 1 0 4 rad / s . . . ratio of rotational energy to translational . . .

What is the magnitude of the electrostatic force between two protons that come within 1 0 1 5 m of one another? Estimate the temperature that a gas must have in order for the protons to be able to approach one another at this distance?

A solid cube is submerged under oil in a vat and is tied to the bottom with a string. What is the magnitude of the tension in the string if the side of the cube is 1 6 cm and the density of oil is 1 1 0 kg / m 3 greater than the cube s density?

How many times does the eyepiece lens magnify the sample?

X Did you find all possible angles? ( a ) What is the angle between the directions of vec ( r ) and vec ( F ) if the magnitude of the associated torque equals 0 N * m ? 0 \ deg Greater than 0 \ deg but less than 9 0 \ deg 9 0 \ deg Greater than 9 0 \ deg but less than 1 8 0 \ deg 1 8 0 \ deg
X Did you find all possible angles? ( a ) What is

An astronomer is observing a binary star that is 1 5 pc away. The two stars have an orbital separation of 5 . 5 AU . If the astronomer is observing the binary star at a wavelength of 7 2 0 nm , what is the minimum aperture of the telescope that is needed in order to resolve the two stars? ( Note: pc ( short for parsec ) and AU ( short for
An astronomer is observing a binary star that is

Question 3 : How well did the values match the expected values in each case? Were there any experiments that were significantly less effective than another? Why might this have occurred? Explain your responses.
Question 3 : How well did the values match the

According to the Galilean transformation equations, the position x ' according to a moving observer depends on both the position x and the time t for an unmoving observer, while the time t ' according to a moving observer depends on only the time t for an unmoving observer. What do x ' and t ' depend on according to the Lorentz tranformation
According to the Galilean transformation

Part B - What is the INTERNAL ENERGY of this ideal gas if it contains 3 . 6 moles of molecules? Use scientific notation, in Joules
Part B - What is the INTERNAL ENERGY of this

Where is the near point of an eye for which a contact lens with a power of + 2 . 6 5 diopters is prescribed?

A horizontal rectangular surface has dimensions 3 . 1 0 cm by 3 . 7 0 cm and is in a uniform magnetic field that is directed at an angle of 3 1 . 0 above the horizontal. Part A What must the magnitude of the magnetic field be to produce a flux of 4 . 0 0 1 0 4 Wb through the surface? Express your answer with the appropriate units. Activate to

The force on a wire is a maximum of 8 . 0 0 1 0 - 2 N when placed between the pole faces of a magnet. The current flows horizontally to the right and the magnetic field is vertical. The wire is observed to "jump" toward the observer when the current is turned on .
The force on a wire is a maximum of 8 . 0 0 1 0 -

A triangular plate is acted on by three forces, as in the figure. Taking the + z - direction to be out of the screen, calculate the net torque ( magnitude and direction ) about red point O if d 1 = 3 m , d 2 = 1 . 7 m , F 1 = 2 7 N , F 2 = 4 9 N , F 3 = 5 4 N , 2 = 2 7 , and 3 = 1 5 .
A triangular plate is acted on by three forces,

A portable pelvis exam was performed at 9 0 kVp and 8 mAs. To increase differential absorption what would you new technique be ? Question options: 1 0 3 . 5 kVp @ 1 6 mAs 7 6 . 5 kVp @ 4 mAs 1 0 3 . 5 kVp @ 4 mAs 7 6 . 5 kVp @ 1 6 mAs

a stone falls downward from point A to point C passing by point B which is 4 0 m above ground. the stone takes 1 . 7 5 sec to fall from B to C . Calculate the velocity of the stone as it passes point B

what is the strength of the electric field 9 . 0 mm from a proton?

A 5 0 0 - kg cannon fires a 4 . 0 - kg projectile with a velocity of 4 0 0 m / s relative to the ground. What is the recoil speed of the cannon? A 5 0 0 - kg cannon fires a 4 . 0 - kg projectile with a velocity of 4 0 0 m / s relative to the ground. What is the recoil speed of the cannon? 5 . 0 m / s 3 . 2 m / s 4 . 0 m / s none of the above

Electricity is distributed from electrical substations to neighborhoods at 1 . 6 1 0 4 VV . This is a 6 0 HzHz oscillating ( AC ) voltage. Neighborhood transformers, seen on utility poles, step this voltage down to the 1 2 0 VV that is delivered to your house.

a double conex lens is made from glass with an index of refraction

An infant's toy has a 1 2 0 gg wooden animal hanging from a spring. If pulled down gently, the animal oscillates up and down with a period of 0 . 5 4 ss . His older sister pulls the spring a bit more than intended. She pulls the animal 3 0 cmcm below its equilibrium position, then lets go . The animal flies upward and detaches from the spring

How did you get the expression for the stretch of the spring

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