Answer
$0\ N.m$
Work Step by Step
Given;
Length of a bicycle pedal arm is $r=0.152\ m$
Downward acting force $F=111\ N$
Inclination angle $θ=180^{\circ}$
The magnitude of the torque is given by:
$τ=Frsinθ$
$τ=(111 N)(0.152 m)(sin180^{\circ})$
$τ=0\ N.m\ (since \sin 180^{\circ} = 0)$
