4. A small object of mass m is suspended from a string of length L . The
gravitational acceleration is g. The object revolves in a horizontal circle of
radius r with constant speed. Find the period T of revolution.
(A)
(B)
(C)
(D)
(E) 
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統計: A(1), B(1), C(16), D(1), E(0) #3429523
統計: A(1), B(1), C(16), D(1), E(0) #3429523