Questions from College Physics

Q: 1. After getting on the Santa Monica Freeway, a sports

1. After getting on the Santa Monica Freeway, a sports car accelerates from 30 mi/h to 90 mi/h. Its kinetic energy (a) increases by a factor of /. (b) increases by a factor of 3. (c) increases by a...

Q: 1. Two particles A and B of equal mass are located

1. Two particles A and B of equal mass are located at some distance from each other. Particle A is at rest while B moves away from A at speed v. What happens to the center of mass of the system of two...

Q: What is the relationship between average velocity and instantaneous velocity? An

What is the relationship between average velocity and instantaneous velocity? An object can have different instantaneous velocities at different times. Can the same object have different average veloc...

Q: For high-frequency sounds, the ear's principal method of localization

For high-frequency sounds, the ear's principal method of localization is the difference in intensity sensed by the two ears. Why can't the ear reliably use this method for low-frequency sounds? Doesn'...

Q: Some bats determine their distance to an object by detecting the difference

Some bats determine their distance to an object by detecting the difference in intensity between echoes. (a) If intensity falls off at a rate that is inversely proportional to the distance squared, s...

Q: In fair weather, over flat ground, there is a downward

In fair weather, over flat ground, there is a downward electric field of about 150 NlC. Assume that Earth is a conducting sphere with charge on its surface. If the electric field just outside is 150 N...

Q: A framed poster is covered with glass that has a rougher surface

A framed poster is covered with glass that has a rougher surface than regular glass. How does a rough surface reduce glare?

Q: A person is doing leg lifts with 3.0 kg ankle

A person is doing leg lifts with 3.0 kg ankle weights. She is sitting in a chair with her legs bent at a right angle initially. The quadriceps muscles are attached to the patella via a tendon; the pat...

Q: One of the tricky things about learning to sail is distinguishing the

One of the tricky things about learning to sail is distinguishing the “true wind” from the “apparent wind.” The true wind is the...

Q: In the study of thermodynamics, we thought of a refrigerator as

In the study of thermodynamics, we thought of a refrigerator as a reversed heat engine. (a) Explain how a generator is a reversed electric motor. (b) What kind of device is a reversed loudspeaker?