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A loudspeaker on a homecoming float - mounted on a pole -- is stuck playing at an annoying 210 Hz tone. When the speaker is 10 m away you measure the sound to be a loud 95 dB at 208 Hz.
a. How fast and in what direction is the float moving? What is the physical reason for the change in frequency and what is the phenomenon called?
b. What is the intensity of the signal at this point? What is the power of the speaker?
c. What is the intensity of the sound from the speaker when the loudness is 55 dB? How far is the float from you at this point?
d. How long does the float take to reach the second point?
A rifle with a barrel length of 56 fires an 8 bullet with a horizontal speed of 350. The bullet strikes a block of wood and penetrates to a depth of 14. (a) What resistive force (assumed to be constant) does the wood exert on the bullet? (b) How long..
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who is initially at rest, hops on her back and together they continue down the hill. Illustrate what is their speed at the bottom of the hill if the total vertical drop is 17.0 m? Gayle's mass is 50.0 kg, the sled has a mass of 5.00 kg and her bro..
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An airplane flies at airspeed (speed relative to the air) 112 km/h, In what direction should the pilot head the plane and What would be the ground speed of the plane
Coherent light with wavelength of 602 passes by two very narrow slits and the interference pattern is observed on a screen a distance of 3.00 from the slits. The first-order bright fringe is a distance of 4.84 from the center of the central bright..
A bird is flying directly toward a stationary bird-watcher and emits a frequency of 1330 Hz. The bird-watcher, however, hears a frequency of 1410 Hz. What is the speed of the bird, expressed as a percentage of the speed of sound?
suppose an electric motor continuously operating with average power 4.65 kW runs the pump. Find its efficiency.
A car travelling at 25.0 m/s runs out of gas while travelling up a 33.0 degree slope. How far up the hill would it coast before starting to roll back down.
A 3.2 kg block of wood sits on a table. A 3g bullet, fired horizontally at a speed of 490 m/s, goes completely through the block, emerging at a speed of 250m/s. What is the speed of the block immediately after the bullet exits.
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