3. (Problem 3.35 from the text book) The electric motor exerts a 500-N m torque on the aluminum shaft ABCD when it is rotating at a constant speed. Knowing that G = 27 GPa and that the torques exerted on pulleys B and C are as shown, determine the angle of twist between (a) B and C, (b) B and D. 300 N. m 200 N m 4S mm 0.9 m 44 mm 1.2 m 40 mm 1 m in. is applied at end A of the 4. (Problem 3.53 from the text book) A torque T = 40 kip

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Free Body Diagram

The system of forces acting on a body tends to either rotate it or make the body undergo motion. In general, when an external agent exerts a force on a body, the body undergoes translational motion and rotational motion. The body has six degrees of freedom under the influence of that force. Here, three degrees of freedom are from the translational motion while the other three are from the rotation motion. However, sometimes the bodies are not allowed to undergo any motion and are fixed, under such conditions the body is said to be constrained.