Chapter 6, Problem 75P

The pumping unit is used to recover oil When the walking beam ABC is horizontal, the force acting in the wireline at the well head is Fe 250 Ib. Determine the torque M which must be exerted by the motor in order to evercome this load. The horse-head Cweighs 59 lb and has a center of gravity at Ge. The walking beam ABC has a weight of 130 Ib and a center of gravity at Gn and the counterweight has a weight of 210 Ib and a center of gravity at Gw. The pitman, AD is pin connected at its ends and has negligible weight (Eguee 1) E Redew Part A Detemine the torque M which must be exerted by the motor Express your answer to three significant figures and include the appropriate units. Figure 1 of 1 Value lb ft 68 16 Submit Previoun Answecs HenuestAnswet X Incorrect: Try Again 250 < Return to Assignment Provide Eeedback

The pumping unit is used to recover oil. When the walking beam ABC is horizontal, the forceacting in the wireline at the well head is 250 lb. Determine the torque M which must beexerted by the motor in order to overcome this load. The horse-head C weighs 60 lb andhas a center of gravity at Gc. The walking beam ABC has a weight of 130 lb and a centerof gravity at GB, and the counterweight has a weight of 200 lb and a center of gravity atGW. The pitman, AD, is pin connected at its ends and has negligible weight.

Determine the n- and t-components of the force F which is exerted by the rod AB on the crank OA. Evaluate your general expression for F = 118 N and (a) e = 30°, B = 25° and (b) e = 21°, B = 29° Answers: (a) Fn= i N, F: = i N (b) Fn = i N. F:= N