(a) Find the tensions T 1 and T 2 in the upper and lower strings in termsof m ,

Question

(a) Find the tensions T1and T2 in the upper and lower strings in termsof m, a, and g.
(b) What are the tensions if the elevator cable breaks? 2)In the figure below, m1 = 10.0 kg and m2 = 3.5 kg. The coefficient of static friction betweenm1 and the horizontal surface is 0.50 while the coefficient of kinetic friction is0.30. (a) If the system is released from rest, whatwill its acceleration be?
1 m/s2

(b) If the system is set in motion with m2moving downward, what will be the acceleration of the system?
2 m/s2

Explanation / Answer

IF the elevator is moving upwards, then applying the Newton's lawof motion to the upper block we get                           T1 = m1a = ma And applying the Newton's equations of motion to the lower block weget                     T2 - m2g = m2a                          T2 = m2a + m2g                               = ma + mg                              = m(a + g)

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