A change in a physical quantity w having initial value wi and final value wf is given by which of the following?
a. wi ? wf
b. wf ? wi
c. (wf + wi)/2
d. none of the above
b
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Room temperature is approximately
A) 68. K. B) 300.°F. C) 300. K. D) 68.°C. E) -68.°F.
Rotational Dynamics: As shown in the figure, a 35.30-kg box is attached to a light string that is wrapped around a cylindrical frictionless spool of radius 10.0 cm and moment of inertia 4.00 kg ? m2. The spool is suspended from the ceiling, and the box is then released from rest a distance 3.50 m above the floor. How long does it take for the box to reach the floor?
A. 2.97 s B. 2.85 s C. 0.892 s D. 4.18 s E. 5.89 s
Two continuous waves having the same wavelength and amplitude pass through the same medium. They are aligned crest to crest and trough to trough so that they interfere. The resulting wave has
A) the same wavelength and the same amplitude. B) twice the wavelength and twice the amplitude. C) zero amplitude. D) twice the wavelength and the same amplitude (or height) as each of the individual waves. E) the same wavelength and twice the amplitude.
The speeds of 25 molecules are distributed as follows: 5 in the range from 2 to 3 m/s, 10 in the range from 3 to 4 m/s, 5 in the range from 4 to 5 m/s, 3 in the range from 5 to 6 m/s, 1 in the range from 6 to 7 m/s, and 1 in the range from 7 to 8 m/s. Their average speed is about:
A. 2 m/s B. 3 m/s C. 4 m/s D. 5 m/s E. 6 m/s