The bigger diameter gears on the rear wheel of a multi-speed bike allow the rider to
A. decrease the moment of inertia of the wheel.
B. increase the moment of inertia of the wheel.
C. exert more force on the wheel.
D. exert more torque on the wheel.
Answer: D
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The photons coming from blackbody radiation create a(n) ____ spectrum
a. absorption b. emission c. Doppler d. continuous e. ionization
In a severe drought, groundwater does not get recharged. To get to the groundwater
A) deeper wells must be dug. B) more water wells are needed. C) water wells need to be located next to streams. D) water wells need to be dug at higher elevation.
Uniform Circular Motion: A child sits on a merry-go-round, 1.5 meters from the center. The merry-go-round is turning at a constant rate, and the child is observed to have a radial acceleration of 2.3 m/s2. How long does it take for the merry-go-round to make one revolution?
Fill in the blank(s) with the appropriate word(s).
If the objects seen in the past are galaxies, how might they have changed?
A. Galaxies would have had less star formation in the past than at present. B. There were more ellipticals in the past and would be spirals at present. C. Things would have had a larger mass in the past than at present. D. They would have been destroyed by supernovae explosions by the present time. E. The galaxies were more irregular and patchy in the past than they are at present.