4. A block of mass m = 0.4 (kg) is placed on a block of mass M = 0.8 (kg) as shown in the left figure. The coefficient of kinetic friction for all surfaces is μk = 0.1. Ignore the pulley and the rope. For what value of the horizontal force F will the blocks move at constant speed?
(A) 0.98 Nt
(B) 1.18 Nt
(C) 1.57 Nt
(D) 1.96 Nt
(E) 2.35 Nt
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統計: 尚無統計資料
統計: 尚無統計資料