A ball is rolled horizontally off a table with an initial speed of 0.24 m/s. A stopwatch measures the ball's trajectory time from table to the floor to be 0.36 s. What is the height of the table? (g = 9.8 m/s2 and air resistance is negligible)
a. 0.72 m
b. 0.55 m
c. 0.016 m
d. 0.64 m
e. 0.65 m
d
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If a 1 050-kg car was moving at 25 m/s, what would be its kinetic energy expressed in the unusual (for kinetic energy) units of calories? (1 cal = 4.186 J)
a. 3.1E+5 b. 3.3E+5 c. 6.6E+5 d. 7.8E+4 e. 6.3E+3
In an interference pattern, the wavelength and frequency are
a. the same in both the regions of constructive interference and the regions of destructive interference. b. greater in regions of constructive interference than in regions of destructive interference. c. smaller in regions of constructive interference than in regions of destructive interference. d. unchanged in regions of destructive interference but greater in regions of constructive interference. e. unchanged in regions of destructive interference but smaller in regions of constructive interference.
The time it takes a projectile fired straight up at 10 m/s to reach the top of its path is about
A) 1 s. B) 2 s. C) 10 s. D) not enough information
A problem with the classical theory for radiation from a blackbody was that the theory predicted too much radiation in the ________________ wavelengths.
A. ultraviolet B. visible C. infrared D. microwave E. radio