Physics PS (Statics & Rotational Dynamics) questions
Saturday, November 5, 2011 by Anonymous in Labels: ,

For those without Giancoli 3rd ed! (credits to Issa of 3-Na for the scans)


25. (II) Calculate the net torque about the axle of the wheel shown in Fig. 8-35. Assume that a friction torque of 0.30 N•m opposes the motion.

14. (II) Calculate F1 and F2 for the beam shown in Fig. 9-48. Assume it is uniform and has a mass of 280 kg.

16. (II) A 160-cm-tall person lies on a light (massless) board which is supported by two scales, one under the feet and one beneath the top of the head (Fig. 9-50). The two scales read, respectively, 29.4 and 32.8 kg. Where is the center of gravity of this person?


31. (II) A grinding wheel is a uniform cylinder of radius 12.5 cm and mass 0.880 kg. Calculate (a) its moment of inertia, and (b) the torque needed to accelerate it from rest to 1200 rpm in 4.00 s if a frictional torque of 0.0145 N•m is also acting.

33. (II) A 1.20-m-diameter sphere can be rotated about an axis through its center by a torque of 25 N•m, which accelerates it uniformly from rest through a total of 180 rev in 15 s. What is the mass of the sphere?

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