Question

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)

• A. 49 N
• B. Zero Newton
• C. 36.75 N
• D. 2.45 N

Answer 1

Answer: (C)

36.75 N

Answer 2

Q a = $\frac { \mathrm { mg } - \mu \mathrm { mg } } { \mathrm { m } + \mathrm { m } }$ = g/4

\ mg – T = ma

̃ T = mg – ma = 5g – 5g/4

= $\frac { 15 } { 4 } \mathrm {~g}$ = 36.75 N