Questions from College Physics

Q: Two children ride on a merry-go-round. One

Two children ride on a merry-go-round. One is 2 m from the axis of rotation and the other is 4 m from it. Which child has the larger (a) linear speed, (b) acceleration, (c) angular speed, and (d)...

Q: 100. At 3:00 P.M., a

100. At 3:00 P.M., a bank robber is spotted driving north on I-15 at milepost 126. His speed is 112.0 mi/h. At 3:37 P.M., he is spotted at milepost 185 doing 105.0 mi/h. During this time interval, wha...

Q: A ship mapping the depth of the ocean emits a sound of

A ship mapping the depth of the ocean emits a sound of 38 kHz. The sound travels to the ocean floor and returns 0.68 s later. (a) How deep is the water at that location? (b) What is the wavelength o...

Q: Find the ratio of the rotational inertia of Earth for rotation about

Find the ratio of the rotational inertia of Earth for rotation about its own axis to its rotational inertia for revolution about the Sun.

Q: If the cardiac output of a small dog is 4.1

If the cardiac output of a small dog is 4.1 × 10−5 m3/s, the radius of its aorta is 0.50 cm, and the aorta length is 40.0 cm, determine the pressure drop across the aorta of the dog. Assume the viscos...

Q: A bat emits chirping sounds of frequency 82.0 kHz while

A bat emits chirping sounds of frequency 82.0 kHz while hunting for moths to eat. If the bat is flying toward the moth at a speed of 4.40 m/s and the moth is flying away from the bat at 1.20 m/s, what...

Q: In an aortic aneurysm, a bulge forms where the walls of

In an aortic aneurysm, a bulge forms where the walls of the aorta are weakened. If blood flowing through the aorta (radius 1.0 cm) enters an aneurysm with a radius of 3.0 cm, how much on average is th...

Q: The bat of Problem 55 emits a chirp that lasts for 2

The bat of Problem 55 emits a chirp that lasts for 2.0 ms and then is silent while it listens for the echo. If the beginning of the echo returns just after the outgoing chirp is finished, how close to...

Q: Scuba divers are admonished not to rise faster than their air bubbles

Scuba divers are admonished not to rise faster than their air bubbles when rising to the surface. This rule helps them avoid the rapid pressure changes that cause the “bends.” Air bubbles of 1.0 mm ra...

Q: Doppler ultrasound is used to measure the speed of blood flow (

Doppler ultrasound is used to measure the speed of blood flow (see Problem 49). The reflected sound interferes with the emitted sound, producing beats. If the speed of red blood cells is 0.10 m/s, the...