Exam 32: (AP) Physics: Introductory Physics

A student is sitting in a large stadium far away from the starting line of a footrace, while listening to the footrace on the radio. As the race starts, the student hears the sound of the starting pistol on the radio. Shortly after that, the student hears the sound of the starting pistol from inside the stadium.Which of the following best explains these observations?

To locate objects in their environments, bats in flight and porpoises under water both use ultrasound waves with frequencies that are beyond human hearing. These animals produce an ultrasonic wave and then detect echoes from nearby objects.If a porpoise and a bat both produce ultrasonic waves when they are 16 m from an object, which animal would hear its echo first and why?

A ball is thrown straight upward. The ball's initial speed is 30 m/s and its mass is 0.05 kg, resulting in an initial kinetic energy of 22.5 J.If the initial potential energy of the ball is 10 J and there is no frictional force, what would be the ball's total energy while it is moving?

Electric charges can move most easily on which of the following objects?

How much power is required to carry a 35 N package a vertical distance of 18 m if the work on the package is accomplished in 30 s?

An engineering student is gathering data on the motion of a model car traveling down a ramp. If energy is conserved, the potential energy of the car at the top of the ramp should equal the kinetic energy of the car at the bottom of the ramp. After the first trial, the student calculates that the kinetic energy at the bottom of the ramp is less than the potential energy at the top of the ramp. Which of the following can best explain this difference?

Which of the following statements applies to a longitudinal wave?

How long will it take a car to accelerate from 20 m/s to 26 m/s at a rate of 1.4 m/s2?

The source of a sound is moving away from an observer who is standing still. How do the sound waves received by the observer compare with those emitted by the source?

Ultraviolet light has a shorter wavelength than visible light. Which of the following is another way ultraviolet light can be compared to visible light?

A student is driving her car when an insect strikes her windshield. Which of the following statements best describes the forces in this situation?

The momentum of an object in space is

Which of the following will always change when an object accelerates?

A student swings a bat horizontally, making contact with a ball thrown to her. The ball leaves the bat, and the bat continues moving through the rest ofthe swing. Which of the following statements describes the change in energy ecessary to do work on the ball?

A toy cart that has a weight of 10 N moves with a constant velocity of 2 m/s to the right on a horizontal table. According to Newton's laws of motion, which of the following statements is correct?

Which of the following statements describes the electric force betweentwo oppositely charged particles as they approach each other?

A heavy box is at rest on an inclined plane. The box begins to slide down the inclined plane when a small force is applied to the box. The force is removed as soon as the box begins to slide. The speed of the box increases as the box slides down the inclined plane.Which of the following is the most likely cause of this increasing speed?

A student standing on the edge of a swimming pool sees a painted mark on the bottom of the pool. The mark appears to be at a shallower depth than the actual depth of the pool.Which of the following descriptions of light waves best explains this observation?

Which of the following is a main factor that affects the speed of a wave?

The power of a toaster can be determined if which of the following values are known?