Non Zero Torque - Introduction to Physics - Solved Exam, Exams of Physics

Download Non Zero Torque - Introduction to Physics - Solved Exam and more Exams Physics in PDF only on Docsity! 4. (25 pts) a) (5 pts) Which of the forces pictured as acting on the rod in the diagram below will produce a non-zero torque about an axis of rotation at the end of the rod? Axis of Rotation (the hinge) F1 F2 Force F1 will produce a non-zero torque. F2 is directed towards the axis of rotation and thus will produce no torque. b) (10 pts) A net torque of 60 N·m is applied to a disk with a rotational inertia (ie. moment of inertia) of 12 kg·m2. What is the rotational acceleration of the disk? τ = Iα α = τ I = 60 12 = 5 rad/s 2 c) (10 pts) A uniform disk (I = 1 2 mr2) with a mass of 4 kg and a radius of 0.2 m is rotating with a rotational velocity of 20 rad/s. What is the angular momentum of the disk? I = 1 2 (40)(0.2)2 = 0.8 kg · m2 L = Iω = (0.8)(20) = 16 kg · m2/s