AP Physics 1 Final

Two small, identical metal spheres are projected at the same time from two identical spring guns....... 1. How does the speed of the vertically launched sphered compare to that of the horizontally launched as they each hit the floor? 2. How does the time for the vertical to hit the floor compare to the horizontal? 3. How does the work done by gravity on the vertical compare to the horizontal?

1. A. It is the same 2. C. It is greater but not necessarily twice as great 3. A. It is the same

A racing car is speeding around a flat, circular track whose radius is 250 m. The car's speed is a constant 50 m/s, and the car has a mass of 2000 kg. 1. The centripetal force necessary to keep the car in its circular path is provided by 2. The magnitude of the car's centripetal rose is equal to

1. C. Friction 2. D. 20,000 N

A stopper of mass M is tied to a string of length R and swings around horizontally in uniform circular motion with a velocity of v when acted on by a force of F. 1. What is the period of the stopper? 2. What is the power developed by the force?

2. The power is 0.

A simple harmonic oscillator has a frequency of 2.5 Hz and an amplitude of 0.05 m. What is the period of the oscillations?

A. 0.4 s

A small cart of mass M is initially at rest. It collides elastically with a large cart of mass 4M and velocity v. The large cart loses half its kinetic energy to the little cart. The little cart now has a velocity of

A. 1.41v

the gravitational force the sun exerts on the earth is F. Mars is 1.5 times from the sun than the earth and its mass is 1/6 of the earth's mass. What is gravitational force that the sun exerts on mars?

A. 2/27F

Two traveling waves of equal frequency, one of amplitude 4 cm and the other of amplitude 6 cm, superimpose in a single medium. Which of the following best describes the displacement, D, of the resultant wave?

A. 2cm ≤ D ≤ 10cm

A mass on a string and a simple pendulum ungergo simple harmonic motion. There is no friction present for the mass on the string. Which of the following statements are true? Select two answers.

A. Mechnical energy is constant C. The period of the mass is constant.

Wire Y is made of the same material but has twice the diameter and half the length of wire X. If wire X has a resistance of R then Wire Y would have a resistance of...

A. R/8

If the acceleration of an object is not zero, which of the following could be constant? Select two answers.

A. Speed C. Kinetic energy

An object traveling at x m/s can stop at distance d m with a maximum negative acceleration. If the car is traveling at 2x m/s, which of the following statements are true? Select two answers.

A. The stopping time is doubled D. The stopping distance is quadrupled.

In the circuit above, with the switch closed, what will the Voltmeter V read? Select two answers

A. Voltage drop across R1 C. Voltage drop across R2

A musician plucks a string on an acoustic guitar. Standing waves will most likely occur in which of the following media? Select 2 answers.

A. guitar string C. the air outside the guitar

How much current does a 60 W lightbulb draw if it operates at a voltage of 120 V?

B. 0.5 A

Two equally positive charges are R distance apart. If the amount of charge on one is doubled and the distance between the charges is doubled, what is the ratio of new electric force to old electric force?

B. 1/2

Two small masses, X and Y, are d meters apart. The mass of X is 4 times as great as the mass of Y. Mass X attracts Mass Y with a gravitational force of 16 N. The force which Y attracts X is equal to

B. 16 N

A rope of length 60cm is tied to the handle of a bucket (whose mass is 3kg) and the bucket is then whirled in a vertical circle. At the bottom of this path, the tension in the rope is 50 N. What is the speed of the bucket at this point?

B. 2 m/s

an object is thrown horizontally off a high cliff at 7.5 m/s. What is its displacement after2 seconds?

B. 25m

An astronaut lands on a planet whose mass and radius are each twice that of earth. If the astronaut weighs 800 N on earth, how much will he weigh on this planet?

B. 400 N

The sun is approximately 150 million km from the earth. A year- the time for one revolution of the earth around the sun- is roughly π x 10^7 seconds. Assuming a circular orbit, what best approximates the average acceleration of the earth due to the sun?

B. 6 x 10^-3 m/s^2

Which of the following could be used to calculate the time in flight for a horizontally launched projectile on earth? Select two answers.

B. Final vertical velocity D. Initial height

As an ice skater draws her arms inwards during a spin, which of the following remain constant? Select two answers

B. Her angular momentum D. Her center of mass

Wire 1 has 3 times the length and twice the diameter of wire 2. If both wires are made of the same material and if R1 is the resistance of wire #1 and r2 is the resistance of wire #2 then which of the following is true?

B. R2=(4/3)R1

N resistors (N>2) are connected in parallel with a battery of voltage V. If one of the resistors is removed from the circuit, which of the following quantities will decrease? Select two answers.

B. The current output by the battery. C. The total power dissipated in the circuit.

A projectile is launched at an angle such that it undergoes projectile motion. In the absence of air resistance, which of the following statements is Correct?

B. The horizontal velocity remains constant during the flight.

A sound wave travels through a metal rod with wavelength λ and frequency f. Which of the following is true? Statement two answers.

B. When the sound wave passes into air, the wavelength will change. D. While in the metal rod, the λ and frequency f have an inverse relationship.

a person standing on a horizontal floor is acted upon by two forces: the downward pull of gravity and the upward normal force of the floor. These two forces

B. have equal magnitudes and do not form an action reaction pair

Two objects, A and B, have equal charge and mass. Neither body is in motion because the gravitational and electrostatic forces between them are equal. If the mass of object A is halved, equilibrium will be maintained if

B. the charge on object B were halved

A sound wave with speed f travels through the air at speed v. With what speed will a sound wave with frequency 4f travel through the air?

B. v

The sound of a moving siren moving from the west of you that is traveling toward you is transmitted through the air and to your ear and is

B. vibrating in a west-east direction

A 12 volt battery is advertised as a 40 amp hour battery. The manufacturer is expressing that the battery has a capacity of

C. 1,728,000 J

A 1000kg object is hung on a string in between two identical towers that are 340 m apart. The object sits 100m below the height of the towers. What is the tension in the string?

C. 10 kN

A rope stretched between two fixed points can support transverse standing eaves. What is the ratio of the sixth harmonic frequency to the third harmonic frequency?

C. 2

A 100 kg object is attached to a spring mounted to the ceiling with a spring coefficient of k=100 N/m. If the spring is stretched by 30 m from the initial resting position with the block attached, what is it's acceleration at that point?

C. 20 m/s^2

An object of 100 kg rests on a horizontal floor. the coefficient of static friction is 0.4 between the object and the floor. If a constant force of 250 N is pushed horizontally on the object what is the magnitude of the force of static friction?

C. 250 N

Object 1 of mass 0.25 kg moves at 10 m/s towards object 2 initially at rest of mass 0.25 kg. the resulting collision is perfectly inelastic what is the speed of the objects after the collision?

C. 5 m/s

An object begins at rest at the top of an inclined frictionless plane with a height of 125 m and horizontal length (not hypotenuse) of 200 m. What will be the speed of the object at the end of the inclined plane?

C. 50 m/s

An alarm whose frequency is 400 Hz is dropped out of a third-floor window. The student who drops it measures the frequency with a very sensitive oscilloscope. The measured frequency

C. Appears lower than 400 Hz and the frequency decreases as it falss

Flip card

C. Be 3 times weaker than the situation on the left

In which of the following situations involving a source of sound and a detector of sound is it possible that there is NO perceived doppler shift?

C. Both the source and the detector travel in the same direction

The sound of a moving siren moving from the west of you that is traveling toward you is transmitted through the air and to your ear and is

C. Heard at a higher frequency than usual

Which of the following changes to a circuit will always bring about an increase in the current?

C. Increased voltage and decreased resistance

Sound waves travel at 350 m/s through warm air and 3500 m/s through brass. What happens to the wavelength of a 700 Hz acoustic wave as it enters brass from warm air?

C. It increases by a factor of 10

A 2kg mass is attached to a massless, 0.5 m string and is used as a simple pendulum extending it to an angle θ= 5 degrees and allowing it to oscillate. Which of the following changes will change the period of the pendulum? Select two answers.

C. Replacing the string with a 0.25 m string D. Moving the pendulum to the surface of the moon

A beam of monochromatic light entering a glass window pane in the air will experience a change in

C. Speed and wavelength

A lightweight toy car crashes head on into a heavier toy truck. Which of the following statements is true as a result of the collision? Select 2 answers.

C. The magnitude of the acceleration experienced by the car will be greater than that experienced by the truck. D. the total momentum in the collision will be conserved.

An old record player could bring a disk up to its 45 RPM speed in less than a minute. If the same size disk can also be Brought up to a speed of 75 RPM in about the same time on another player, compare the two torques.

C. The torque would be larger in the second case as it requires a greater angular acceleration.

A planet has half the mass of the Earth and half the radius. Compared with the acceleration due to gravity on the surface of the earth, the acceleration due to gravity on the surface of this planet is

C. doubled

For a falling object to reach terminal velocity, the magnitude of the force due to air friction must be

C. equal to mg

A ball is thrown in a projectile motion trajectory with in initial velocity v at an angle θ above the ground. If the acceleration due to gravity is -g, which of the following is the correct expression of the time it takes the ball to reach its highest point, y, from the ground?

C. vsin θ/g

An object of mass 3kg is undergoing uniform circular motion. The objects speed is 4 m/s, and the radius of the path is 0.5m. How much work is done on this object by the centripetal force?

D. 0 J

A satellite weighs 10^4 N at ground control. What best approximates the acceleration it experiences in orbit at an altitude of twice the earth's radius?

D. 1.1 m/s^2

Two objects are sitting on a uniform stick that pivots around its center. Object 1 has a mass of 20kg and object 2 has a mass of 30 kg. If object 2 sits 1m to the left of the center of the stick, how far to the right of the center of the stick must object 1 sit in order to balance the stick?

D. 1.5m

An object of mass 5 kg is acted upon by exactly four forces, each of magnitude 10 N. Which of the following could not be the resulting acceleration of the object?

D. 10 m/s^2

An elevator has a mass of 500 kg. It may safely carry an additional mass of 1000 kg and accelerate upward at 2 m/s^2. What is the tension in the cable under these maximum conditions?

D. 18,000 N

A rectangular book weighing 20 N with sides of 10 cm and 20 cm is placed on the horizontal table. Using each of your hands, you exert forces of 10 N each in opposite directions at opposite corners such that you are pushing parallel to the shorter side in each case. What net torque are you providing the book?

D. 2 nxm

A crane lifts a shipping crate that weighs 5000 N at a constant speed of 4 m/s. At what rate is this crane doing work on the crate?

D. 20,000 W

A person is pulling a block of a mass m with a force equal to its weight directed 30 degrees above the horizontal plane across a rough surface, generating a friction f on the block. If the person is now pushing downward on the block with the same force of 30 degrees above the horizontal plane across a rough surface, what is the friction on the block?

D. 3f

An object has a kinetic energy of K. If the speed of the object were doubled what would be the resulting kinetic energy?

D. 4K

A spring of force constant 800 N/m is hung from a ceiling. A block of mass 4.0 kg is hung from its lower end and allowed to come to rest. How far will the block stretch the spring?

D. 5.0 cm

Which of the following concerning uniform circular motion is true?

D. A satellite undergoing uniform circular motion is falling towards the center in a circular path.

What happens to the force of gravitational attraction between two small objects if the mass of each object is doubled and the distance between their centers is doubled?

D. It remains the same

You are standing on a railroad track as a train approaches at a constant velocity. Suddenly the engineer sees you, applies the brakes, and sounds the whistle. Which of the following describes the sound of the whistle as you hear it starting from that moment?

D. Loudness increasing, pitch decreasing

Force is to torque as _____ is to moment of inertia.

D. Mass

Two objects a sphere and a block of the same mass are released from rest at the top of an inclined plane. The sphere rolls down the inclined plane without slipping. the block slides down the plane without friction. Which object reaches the bottom of the ramp first?

D. The block, because it does not gain rotational kinetic energy, but the sphere does

A woman standing on a scale in an elevator notices that the scale reads her true weight. From this, she may conclude that

D. the elevator must not be accelerating.

Two people, one of mass 100 kg and the other of mass 50 kg, stand facing each other on an ice covered pond. If the heavier person pushes on the lighter one with a force F, then

D. the magnitude of the acceleration of the lighter person will be twice the magnitude of the acceleration of the heavier person.

An object of mass m (object 1) moving with speed v collides head on with a target of object if mass m2 (object 2) initially at rest. If the collision is perfectly inelastic, what fraction of object 1's initial kinetic energy is lost?

c. 2/3