Question

8.

A force of magnitude 50 N is applied at the bottom point of a disk of radius 5 m that is pinned at P (leftmost point) as shown in the figure.

(a) Find the angle between the force and the vector from P to Q. 

(b) Find the magnitude of the applied torque. 

9.

A torque wrench grips a bolt at the origin of coordinates, with the free end of the torque wrench located at the point (r₀, 0, 0). The force on this end of the torque wrench points in the direction of V = (10, 0, 16). Note that * = (0, 0, 0) in this problem. Compute the length of the lever arm ||L||| needed to produce a torque with magnitude 240 ft-lb if the magnitude of the force is 120 pounds. 

Answer 1