STATICS: CE 201

## Quiz Chapter 3

 1

The patella P located in the human knee joint is subjected to tendon forces T1 and T2 and a force F exerted on the patella by the femoral articular A. If the directions of these forces are estimated from an X-ray as shown, determine the magnitudes of T1 and F when the tendon force T2 = 6 lb.. The forces are concurrent at point O.

T1 = 1.042 lb, F = 5.91 lb
T1 = 4.45 lb, F = 6.82 lb
T1 = 1.203 lb, F = 5.31 lb
T1 = 5.64 lb, F = 5.64 lb

 2

Determine the magnitude and direction of the resultant force FAB exerted along link AB by the tractive apparatus shown. The suspended mass is 10 kg. Neglect the size of the pulley at A.

FAB = 170.0 N, = 15.0°
FAB = 98.1 N, = 75.0°
FAB = 98.1 N, = 15.0°
FAB = 170.0 N, = 75.0°

 3

A "scale" is constructed with a 4-ft-long cord and the 10-lb block D. The cord is fixed to a pin at A and passes over two small pulleys at B and C. Determine the weight of the suspended block E if the system is in equilibrium when s = 1.5 ft.

W = 8.01 lb
W = 14.91 lb
W = 18.33 lb
W = 17.63 lb