5.)if the angular speed of a rotating rigid body is doubled, how will its rotational kinetic energy change?
a. halved
b. stays the same
c. doubled
d. quadrupled
rotational kinetic energy = 0.5 (moment of inertia) * (angular speed) ^2
from above relation,
rotational kinetic energy is directly proportional to square of angular speed
so, on increasing angular speed to twice, rotational kinetic energy becomes quadrapled
option (d) is correct
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