Questions from College Physics

Q: Following a collision in outer space, a copper disk at 850

Following a collision in outer space, a copper disk at 850°C is rotating about its axis with an angular speed of 25.0 rad/s. As the disk radiates infrared light, its temperature falls to 20.0°C. No ex...

Q: At rest, a car’s horn sounds the note A (440

At rest, a car’s horn sounds the note A (440 Hz). The horn is sounded while the car is moving down the street. A bicyclist moving in the same direction with one-third the car’s speed hears a frequency...

Q: An alert physics student stands beside the tracks as a train rolls

An alert physics student stands beside the tracks as a train rolls slowly past. He notes that the frequency of the train whistle is 465 Hz when the train is approaching him and 441 Hz when the train i...

Q: A tuning fork vibrating at 512 Hz falls from rest and accelerates

A tuning fork vibrating at 512 Hz falls from rest and accelerates at 9.80 m/s2. How far below the point of release is the tuning fork when waves of frequency 485 Hz reach the release point?

Q: Expectant parents are thrilled to hear their unborn baby’s heartbeat, revealed

Expectant parents are thrilled to hear their unborn baby’s heartbeat, revealed by an ultrasonic motion detector. Suppose the fetus’s ventricular wall moves in simple harmonic motion with amplitude 1.8...

Q: A supersonic jet traveling at Mach 3.00 at an altitude

A supersonic jet traveling at Mach 3.00 at an altitude of h = 2.00 x 104 m is directly over a person at time t = 0 as shown in Figure P14.35. Assume the average speed of sound in air is 335 m/s over t...

Q: A yellow submarine traveling horizontally at 11.0 m/s

A yellow submarine traveling horizontally at 11.0 m/s uses sonar with a frequency of 5.27 x 103 Hz. A red submarine is in front of the yellow submarine and moving 3.00 m/s relative to the water in the...

Q: Two cars are stuck in a traffic jam and each sounds its

Two cars are stuck in a traffic jam and each sounds its horn at a frequency of 625 Hz. A bicyclist between the two cars, 4.50 m from each horn (Fig. P14.37), is disturbed to find she is at a point of...

Q: The acoustical system shown in Figure P14.38 is driven by

The acoustical system shown in Figure P14.38 is driven by a speaker emitting sound of frequency 756 Hz. (a) If constructive interference occurs at a particular instant, by what minimum amount should t...

Q: The ship in Figure P14.39 travels along a straight line

The ship in Figure P14.39 travels along a straight line parallel to the shore and a distance d = 600 m from it. The ship’s radio receives simultaneous signals of the same frequency f...