The Doppler effect is best described as the

Students are creating standing waves on a string with a wave generator. They start with a very low frequency (1 Hz) and slowly increase the frequency and record the frequency of each standing wave. One of the standing waves they create is shown below. How many antinodes are shown in this standing wave?

Students are creating standing waves on a string with a wave generator. They start with a very low frequency (1 Hz) and slowly increase the frequency and record the frequency of each standing wave. One of the standing waves they create is shown below. How many standing waves will the students find before they discover the one pictured above?

A student is standing in an elevator that travels from the first floor to the tenth floor of a building. The student exerts the greatest force on the floor of the elevator when the elevator is

A graph of the net horizontal force F exerted on an object as a function of x position is shown for the object of mass M as it travels a horizontal distance of 6.0 m. What is the change in kinetic energy of this object over this distance?

The graph below represents the relationship between velocity and time for an object moving along a straight line. What is the magnitude of the object's acceleration?

In addition to the data in the graph above, what else would students need to measure to determine the magnitude of the net force on this object?

A projectile is launched from the ground and lands at the same height from which it was launched. For which initial velocity will the projectile be in the air the longest? [Neglect friction.]

A 5.0-kilogram box is sliding across a level floor. The box is acted upon by a force of 25 newtons east and a frictional force of 15 newtons west. What is the magnitude of the acceleration of the box?

Use the diagram below for questions 11-13. The diagram below represents a 2.0-kilogram toy car moving at a constant speed of 3.0 meters per second counterclockwise in a circular path with a radius of 2.0 meters. At the instant shown in the diagram, the centripetal force acting on the car is:

The diagram below represents a 2.0-kilogram toy car moving at a constant speed of 3.0 meters per second counterclockwise in a circular path with a radius of 2.0 meters. The centripetal force on this toy car at the instant shown in the diagram:

Use the diagram below for questions 11-13. The diagram below represents a 2.0-kilogram toy car moving at a constant speed of 3.0 meters per second counterclockwise in a circular path with a radius of 2.0 meters. If the car hits a patch of ice at the instant shown in the diagram what direction will it continue to move?

Two pulses approach each other in a uniform medium, which diagram best represents the superposition of the two pulses when the pulses overlap?

A toy that is used to launch small plastic spheres vertically into the air contains a spring with a spring constant k N/m. The spring is compressed a distance d when the launcher is ready to launch a plastic sphere. The toy launches the plastic sphere a height H into the air. Friction is negligible. The spring inside the toy is replaced with a new spring with spring constant 2k, how high will the toy now launch the plastic sphere?

The graph below shows the relationship between distance, d, and time, t, for an object moving in a straight line. Which of the graphs below could represent the velocity-time graph that matches the position-time graph above?

A student wishes to record a 7.5-kilogram watermelon colliding with the ground at a speed of 30 m/s. How long must the watermelon fall freely from rest so it would be traveling at 30 m/s the instant it hits the ground?

As represented in the diagram below, block A with a mass of 100 grams slides to the right at 4.0 meters per second and hits stationary block B with a mass of 150 grams. After the collision, block B slides to the right and block A rebounds to the left at 1.5 meters per second. [Neglect friction.] What is the speed of block B after the collision?

A cart with mass 1 kg travels along a horizontal, frictionless surface. A net force is applied to the cart, as shown in the graph above. The initial and final direction of the cart and the direction of the net force exerted on the cart is unknown. Which of the following diagrams could represent the direction and relative magnitude of the velocity of the cart before the force is applied and after the force is applied? Each grid represents a velocity of 1 m/s.

A student conducts three different experiments with a pendulum, as shown in the diagram below. Rank the period of each pendulum from greatest to least.

A wave generator produces straight, parallel wave fronts in a shallow tank of uniform-depth water. As the frequency of vibration of the generator increases, which characteristic of the wave will always decrease?

A student claps his hands once to produce a sudden loud sound that travels through the air. This sound is classified as a

A person on a ledge throws a ball vertically downward, striking the ground below the ledge with 200 joules of kinetic energy. The person then throws an identical ball vertically upward at the same initial speed from the same point. What is the kinetic energy of the second ball when it hits the ground? [Neglect friction.]

As a student walks downhill at constant speed, his gravitational potential energy

Use the scenario and diagram below for questions 25-26. As shown in the diagram below, a rope attached to an 80.0 N crate is used to exert a force of 45 newtons at an angle of 65 degrees above the horizontal (horizontal component = 19 N, vertical component = 41 N). If the crate is moving with constant velocity what is the force of friction between the crate and the floor?

Use the scenario and diagram below for questions 25-26. As shown in the diagram below, a rope attached to an 80.0 N crate is used to exert a force of 45 newtons at an angle of 65 degrees above the horizontal (horizontal component = 19 N, vertical component = 41 N). What is the Normal force on the crate?

A ball is thrown straight upward from the surface of Earth. Which statement best describes the ball’s velocity and acceleration at the top of its flight?

An object is moving with constant speed in a circular path. The object’s centripetal acceleration remains constant in

How would the mass and weight of an object on the Moon compare to the mass and weight of the same object on Earth?

The diagram above shows a box sliding down an incline at constant velocity. Which arrow represents the direction of the frictional force acting on the box?

Which diagram represents the directions of the velocity, v, and acceleration, a, of a toy car as it moves in a clockwise, horizontal, circular path at a constant speed?

A block is started in simple harmonic motion by pulling it back to x = 0.5 m and releasing it from rest. Students measure the period T and the maximum velocity Vmax of the block during its motion.

The students then repeat the experiment by pulling the block back to 0.8 m and releasing it from rest. How will the new period and maximum velocity compare to the first trial?

A swimmer can swim 2.0 m/s in still water. They want to swim across a 40 m wide river that has a current of 4.0 m/s. If they swim straight across the river (perpendicular to the current flow) how far downriver will they have moved when they get to the other side?

A toy airplane, flying in a horizontal, circular path, completes 10.0 complete circles in 30.0 seconds. When the radius of the plane’s circular path is 4.0 meters the plane experiences a centripetal acceleration Ac. If the plane’s circular radius doubles how will the new centripetal acceleration compare to Ac?

Which pair of graphs represents the vertical motion of an object falling freely from rest?

An object is thrown straight upward. Which graph best represents the relationship between the object's kinetic energy and the height of the object above its release point? [Neglect friction.]

In the diagram below, X represents a single particle of a spring. Which diagram represents the motion of particle X as a longitudinal wave passes through the spring toward the right?

Two construction cranes are used to lift different loads of bricks the same vertical distance. The Crane One lifts 800-kilograms of bricks in 20.0 seconds and the Crane Two lifts 1200-kilograms of bricks in 40.0 seconds. Which crane develops more power while lifting the bricks?

A ball is thrown with a velocity of 35 m/s at an angle of 30.0° above the horizontal. Which quantity has a magnitude of zero when the ball is at the highest point in its trajectory? [Neglect Friction]

The above below represents the relationship between velocity and time of travel for a toy car moving in a straight line. The shaded area under the line represents the toy car's

A child pushes a piece of furniture, mass M, with a horizontal force F across a smooth floor with acceleration a. The child asks an equal strength friend to help push a larger piece of furniture, mass 2M, across the same smooth floor. How will the acceleration of the larger piece of furniture compare to the first? Friction is negligible.

A spring stores 40.0 joules of elastic potential energy when it is compressed 0.20 meter. How much energy will be stored when the spring is compressed by 0.1 meter?

A student throws a ball horizontally from a cliff at a speed of 10 m/s. The ball travels a distance d from the base of the cliff after some time t.

A second ball is thrown from the cliff at a speed of 20 m/s. What is the horizontal distance the second ball lands from the cliff.

A student throws a ball horizontally from a cliff at a speed of 10 m/s. The ball travels a distance d from the base of the cliff after some time t.

A second ball is thrown from the cliff at a speed of 20 m/s. How long will the second ball be in the air.

A 7 kg cart, A, and a 3 kg cart, B, are initially at rest held together on a horizontal frictionless surface. When a compressed spring is attached to one of the carts and released, it pushes the carts apart. Cart B is launched at 6 m/s.

What is the speed of cart A?

A 7 kg cart, A, and a 3 kg cart, B, are initially at rest held together on a horizontal frictionless surface. When a compressed spring is attached to one of the carts and released, it pushes the carts apart. Cart B is launched at 6 m/s.

Which cart experiences a larger average force during the explosion?

A group of students perform an experiment in which object X and object Y have a linear collision on a horizontal frictionless surface. Both objects have a mass of 2 kilogram the data they collect is represented in the graph above.

Which of the objects experience a negative impulse?

A group of students perform an experiment in which object X and object Y have a linear collision on a horizontal frictionless surface. Both objects have a mass of 2 kilogram the data they collect is represented in the graph above.

Which object experience a larger impulse during the collision?

A group of students perform an experiment in which object X and object Y have a linear collision on a horizontal frictionless surface. Both objects have a mass of 2 kilogram the data they collect is represented in the graph above.

Which of the following are true about the momentum and kinetic energy of the system during the collision

Which of the following scenarios could the free body diagram above accurately represent?

A 4 kilogram block sits at the top of a rough incline as shown above, a student measures the block's velocity of 5 m/s as it reaches the bottom of the incline, how much mechanical energy is lost as the block slides down the ramp?

Two students are moving large boxes across a horizontal frictionless floor the students apply horizontal forces of the same magnitude over a distance of 10 meters box a has a mass of 100 kilograms and box B has a mass of 200 kilograms compare the velocities and kinetic energies of the two boxes after traveling to 10 meters.

A mass of 1 kilogram is hung vertically from a spring with an unknown spring constant, the spring stretches displacement D, as shown above. What will be the spring displacement when the mass of 2 kilogram is hung from it.

A transverse wave travels along a stream. The graph above shows the vertical position of the string versus time. If the frequency of the wave is doubled how will this affect the wavelength and speed of this wave?