試題詳解

10. A cord is wrapped on a pulley (treated as a uniform solid disk) of mass M and radius R as shown in the figure. To one end of the cord, a block of mass M is connected and to other end in ( A ) a force of 2Mg and in ( B ) a block of mass 2M. The cord does not slip relative to the pulley as the block falls. Let angular acceleration of the disk in A and B be aa and ae, respectively. So, M, R M, R 2M1g 2M
(A)α_A:α_B = 3:1
(B)α_A: α_B = 1:1
(C)α_A:α_B = 2:1
(D)α_A:α_B = 5:2
(E)α_A:α_B = 7:3