At what temperature would the root-mean-square speed (thermal speed) of oxygen molecules be 13.0 m/s? Assume that oxygen approximates an ideal gas. The mass of one O2 molecule is 5.312 x 10-26 kg. The Boltzmann constant is 1.38 × 10-23 J/K
A) 0.217 K B) 0.0666 K C) 1800 K D) 5410 K
A
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What is wavelength?
a. The amplitude of a wave. b. The distance between identical positions on adjacent wave pulses. c. The distance that the wave travels. d. The distance between a wave's crest and its trough. e. Half the distance between identical positions on adjacent wave pulses.
On a clear night you go outside and face south and see circumpolar stars. Then you turn and face north and you see stars rising in the east and setting in the west. Where are you located on Earth?
a. equator b. a mid-latitude between the equator and the north pole c. south pole d. a mid-latitude between the equator and the south pole
Suppose we launch a disk so it rolls without slipping up an incline. The disk of course slows down as it moves up the incline. But in what direction does the friction force acting on the disk point?
A. Up the incline B. Down the incline C. In some other direction (specify) D. The friction force is zero in this case.
The Sun is composed of about ________ and ________ plus 2% other elements.
A. 50% hydrogen/50% helium B. 71% helium/27% hydrogen C. 77% nitrogen/22% oxygen D. 71% hydrogen/27% helium