17. Two equal forces are applied to a door. The first force is applied at the mi

Question

17. Two equal forces are applied to a door. The first force is applied at the midpoint of the door and the second force is applied at the doorknob. Both forces are applied perpendicular to the door. Which force exerts a greater torque? A. both exert zero torque B. both exert equal torques which are not zero C. the first force exerts a greater torque D. the second force exerts a greater torque E. cannot be determined from the info given 18. Five forces act on a massless rod free to pivot at point P, as shown in Gig 8-1. Which force shown is producing a counter-clockwise torque (vector point out of the page) about point P? A. A B. B C. c D. D E. E 19. Three Identical balls are tied by light strings to the same vertical rod and rotate around it, as below. Rank the balls according to their rotational inertia, least to greatest. A. 1,2,3 B. 3, 2, 1 C. 3, then 1 and 2 tie D. 1,3,2 E. All are the same 20. A seesaw is made of a solid plank of mass 10.0 kg (you cannot neglect its mass!) and t has a le of 3.0 meters. It is balanced on a fulcrum (pivot point) 10 meter from one end of the plank. A 20 mass rests on the end nearest the pivot point. What mass must be at the other end d the plank r balanced? A. 6.67kg B. 7.5kg C. 10.0kg D. 5.0kg E. 1.0kg

Explanation / Answer

20. B = 7.5 kg

20kg * 1m = 10kg * 0.5m + x * 2m
x = 7.5 kg

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