Questions from Modern Physics

Q: A field researcher uses the slow-motion feature on her phone’s

A field researcher uses the slow-motion feature on her phone’s camera to shoot a video of an eel spinning at its maximum rate. The camera records at 120 frames per second. Through what angle does the...

Q: On a very muddy football field, a 110-kg linebacker

On a very muddy football field, a 110-kg linebacker tackles an 85-kg halfback. Immediately before the collision, the linebacker is slipping with a velocity of 8.8 m/s north and the halfback is sliding...

Q: What is the speed of the archerfish immediately after it expels the

What is the speed of the archerfish immediately after it expels the drop of water? (a) 0.0025 m/s; (b) 0.012 m/s; (c) 0.75 m/s; (d) 2.5 m/s.

Q: What is the average force the fish exerts on the drop of

What is the average force the fish exerts on the drop of water? (a) 0.00015 N; (b) 0.00075 N; (c) 0.075 N; (d) 0.15 N.

Q: In one day, a 75­kg mountain climber ascends from

In one day, a 75­kg mountain climber ascends from the 1500­m level on a vertical cliff to the top at 2400 m. The next day, she descends from the top to the base of the cliff, which is at an elevation...

Q: The maximum height a typical human can jump from a crouched start

The maximum height a typical human can jump from a crouched start is about 60 cm. By how much does the gravitational potential energy increase for a 72­kg person in such a jump? Where does this energy...

Q: Two cars collide at an intersection. Car A, with a

Two cars collide at an intersection. Car A, with a mass of 2000 kg, is going from west to east, while car B, of mass 1500 kg, is going from north to south at 15 m/s. As a result, the two cars become e...

Q: Jack (mass 55.0 kg) is sliding due east

Jack (mass 55.0 kg) is sliding due east with speed 8.00 m>s on the surface of a frozen pond. He collides with Jill (mass 48.0 kg), who is initially at rest. After the collision, Jack is traveling at...

Q: To protect their young in the nest, peregrine falcons will fly

To protect their young in the nest, peregrine falcons will fly into birds of prey (such as ravens) at high speed. In one such episode, a 600-g falcon flying at 20.0 m/s hit a 1.50-kg raven flying at 9...

Q: At the intersection of Texas Avenue and University Drive, a yellow

At the intersection of Texas Avenue and University Drive, a yellow subcompact car with mass 950 kg traveling east on University collides with a red pickup truck with mass 1900 kg that is traveling nor...