Question

A light string passes over a frictionless pulley. To one of its ends a mass of 6 kg is attached. To its other end a mass of 10 kg is attached. The tension in the thread will be

• A. 24.5 N
• B. 2.45 N
• C. 79 N
• D. 73.5 N

Answer 1

Answer: (D)

73.5 N

Answer 2

$T = \frac { 2 m _ { 1 } m _ { 2 } } { m _ { 1 } + m _ { 2 } } g = \frac { 2 \times 10 \times 6 } { 10 + 6 } \times 9.8 = 73.5 \mathrm {~N}$