10. A cord is wrapped on a pulley (treat..-阿摩線上測驗
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)αA:αB = 3:1
(B)αA: αB = 1:1
(C)αA:αB = 2:1
(D)αA:αB = 5:2
(E)αA:αB = 7:3