Question

Use the standard conventions of up being the ty direction, right being the +x direction, and counterclockwise as being the positive rotational direction. Five forces act on a thin rod of mass 12kg and length 1m as shown. All five foreacha magnitude. The center of mass of the rod is shown as a dot, and the axis of rotation is an X 1) Which of the forces exert zero torque about the axis shown? a) F b) F3 c) F2, F3.FA d) F2, F3 e) All of them exert nonzero torque 2) Which of the forces exert negative torques about the axis shown? a) F1, F2, F, FS b) F, F3, F4, F5 c) FF d) F e) F1, F2, F3, F4, F5 3) If these five forces are the only forces acting on the object, what be the direction of the rod's rotation when released from rest? All five forces are equal in magnitude. a) - b) + c) O s caused by F, Fy, and Fs (ignore sign of the torque)? 4) Rank the magnitudes of the torques caused by F, F3, and signore a) T1 = Ts > T3 b) Tz > Ti = Ts c) Tz > T2 > Ts d) Ts > T3 >T e) Ts > T > T3 5) What is the moment of inertia about this rod about this axis a) Between 0 and 1kgm b) 1 kgm c) Greater than 1kgm? d) Less than zero e) Zero

Answer 1

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