Beats: Two motors in a factory are running at slightly different rates. One runs at 825.0 rpm and the other at 786.0 rpm. You hear the sound intensity increase and then decrease periodically due to wave interference. How long does it take between successive instances of the sound intensity increasing?
A. 1.54 s
B. 1.43 s
C. 1.66 s
D. 1.79 s
Answer: A
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Which of the following is a consequence of the laws of thermodynamics?
A.Heat can be completely changed into work B.Heat transfers from a cold object to a hot object until equilibrium is reached
C.Atoms can be at any temperature, even absolute zero D.Work can be completely changed into heat
Optical density is directly proportional to
A) mass density. B) light speed. C) index of refraction. D) index of reflection.
A 4.0-pC point charge is placed at the center of a hollow (inner radius = 2.0 cm, outer radius = 4.0 cm) conducting sphere which has a net charge of 4.0 pC. Determine the magnitude of the electric field at a point which is 6.0 cm from the point charge
a. 35 N/C b. 25 N/C c. 30 N/C d. 20 N/C e. 10 N/C
The speed of a 2.0-kg object changes from 30 m/s to 40 m/s during a 5.0-s time interval. During this same time interval, the velocity of the object changes its direction by 90°. What is the magnitude of the average total force acting on the object during this time interval?
a. 30 N b. 20 N c. 40 N d. 50 N e. 6.0 N