Answer to Question #270306 in Physics for Niks

Question

Lesson: Torque

Instruction: Analyze and solve the following problems step-by-step.

1. Find the total torque acting on a body when three forces are applied on the

following: F1=10 N upward at 1 m,F2=20n upward at 2 m and F3=5N downward at 0.5 m.

2. During a machining test on a lathe, the tangential force on the tool is 150 N. If the torque on the lathe spindle is 12 N m. determine the diameter of the work-plece

Answer 1

1 The total torque:

$$\tau=F_1d_1+F_2d_2-F_3d_3=17.5\text{ N}·\text m.$$

2 The diameter is

$$d=\tau/F=12/150=0.08\text{ m}.$$