Discussion Forum



1)

A block of mass 5 kg resting on a horizontal surface is connected by a cord, passing over a light frictionless pulley to a hanging block of mass 5 kg. The coefficient of kinetic friction between the block and the surface is 0.5. Tension in the cord is : (g = 9.8 m/sec2)

832021969_1475602_a2e2645704e64f10aa46ce6c42617442.png


A) 49 N

B) Zero

C) 36.75 N

D) 2.45 N

Answer:

Option C

Explanation:

For block A, T - μN = 5a and N = 5g

832021328_b1oltaxutjn3-s.png

For block B,

5g- T = 5a

 T = 36.75N,  a = 2.45 m/sec2