A torque is applied to the arm which contacts the rocker Neg

A torque is applied to the arm which contacts the rocker. Neglect friction between the arm and the rocker. When the arm and rocker are in the orientations shown, could the force on the rocker be parallel to the arm (I) or perpendicular to the arm (II)? I is possible, II is possible I is possible, II is impossible I is impossible, II is possible I is impossible, II is impossible Cannot say without more information

Solution

torque is defined as product of force and the perpendocular distance from the force.

if the torque is applied to the arm, and also if the force in the arm is parallel to the arm, then the perpendicular distacne from the parallel force to the point of rotation of arm is zero which implies the torque due to that parallel force is zero.

thus the force must not be parallel to the arm.

therefore, the configuration II is possible bu the configuration I is impossible.