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Unformatted text preview: 00 km/h in 10.0 s. If the engine is tuned to increase the
power output by 25%, how long does it take to go from 0 to 100 km/h? (A) 5.0 s (B) 6.0 s (C) 7.5 s (D) 8.0 s The work done while accelerating is
and
so
. Comparing the two
cases gives
since the final kinetic energy is the same. The new efficiency after the
tuneup is
so after the tuneup, (e) [4pt] If a satellite is moved from an orbit with radius 4
to one with radius
km is the Earth’s radius, what happens to its orbital speed?
(A) It increases by a factor of 2. (B) It decreases by a factor of 2. (C) It increases by a factor of 4. , where (D) It decreases by a factor of 4. The force on the satellite in an orbit of radius is
implies that
for the circular orbit, so This implies that is proportional to
, so is proportional to
by 4 therefore divides the speed by a factor of 2. , and Newton’s second law Multiplying the radius...
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This document was uploaded on 03/09/2014 for the course PHYS 221 at Ohio Northern University.
 Fall '12
 ScottYost
 Physics, Force, Friction

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