A Ferris wheel rotating at 20 rad/s slows down with a constant angular acceleration of magnitude 5.0 rad/s2. How many revolutions does it make while slowing down before coming to rest?
A) 3.2 B) 40 C) 6.4 D) 20
C
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An object strongly reflects red light, but readily absorbs all other colors of light. Relative to the number of thermal photons of red light emitted by a black body at the same temperature T, our object’s thermal emission rate of photons of red light will be
A. enhanced. B. Suppressed. C. unchanged. D. The answer depends on the value of T.
The discovery of electromagnetic induction is credited to
A) Joseph Henry in America. B) Michael Faraday in England. C) both of these D) neither of these
The ________ transport subsurface material from the Sun's equator to its poles and back at a depth far below the convection zone
Fill in the blank(s) with correct word
The velocity of a body is graphed as a function of time. The slope of the graph at any point may be identified with
A. instantaneous speed. B. average velocity. C. average acceleration. D. instantaneous velocity. E. instantaneous acceleration.