Question

A block of mass 50 kg can slide on a rough horizontal surface. The coefficient of friction between the block and the surface is 0.6. The least force of pull acting at an angle of 30° to the upward drawn vertical which causes the block to just slide is

• A. 29.43 N
• B. 219.6 N
• C. 21.96 N
• D. 294.3 N

Answer 1

Answer: (D)

294.3 N

Answer 2

For limiting condition $f = \mu R$

$F \sin 30 ^ { \circ } = \mu \left( m g - F \cos 30 ^ { \circ } \right)$ , By solving $F = 294.3 \mathrm {~N}$