Forces are applied on a wheel of radius 20 cm as shown in the figure. The torque produced by the forces 4 N at A, 8N at B, 6 N at C and 9N at D at angles indicated is

Options

A. 5.4 N-m anti-clockwise
B. 1.80 N-m clockwise
C. 2.0 N-m clockwise
D. 3.6 N-m clockwise

Answer

B

Explanation

Force 8 N can also be resolved in tangential and radial directions
`tau_("net")=(9+8 sin 30^(@) -4)(0.2)`N-m clockwise
`=1.8 "N-m"` clockwise.