The diagram below shows a top view uniform solid disk which can be rotated freel

Question

The diagram below shows a top view uniform solid disk which can be rotated freely about a fixed point in its center. Various act on it in the horizontal plane as shown, all of the same size (with the force application point at the tail of the arrow as usual.) Which force exerts the largest torque about the center of the disk? Choose from points a-d, or choice e.) More than one of these tie. How many of these torques act CLOCKWISE? a.) One b.) Two c.) Three d.) All four of these What must be the direction of the net torque? a.) clockwise b.) counterclockwise c.) zero d.) Not enough info. If disk's outer radius and total mass were the same but that mass was not distributed uniformly (instead being more bunched up towards the center), then the angular acceleration of the disk would be: a.) smaller b.) larger c.) the same as before; still same total mass d.) Not enough info Two ice skaters (Abe and Bob) are skating in opposite directions, when they have a head-on collision and come to rest. Which of the following is true about the Abe+Bob system? a.) The momentum of the system is decreased. b.) The mechanical energy of the system is decreased. c.) The mechanical energy of the system is constant. d.) Both skaters must have the same initial speed. e.) None of these What type of collision is this? a.) elastic b.) somewhat inelastic c.) completely inelastic d.) Not enough info. Abe had an initial speed of 10 m/s and a mass of 70 kg. If Bob is twice Abe's mass, then his initial speed was: a.) 1 m/s b.) 5 m/s c.) 10 m/s d.) 20 m/s e.) None of these. Sally is in space, 4 Earth radii away mom Earth's surface. The size of the acceleration due to gravity (g) at her location is: a.) 0 m/s^2 b.) 0.39 m/s^2 c.) 0.61 m/s^2 d.) 1.96 m/s^2 e.) 9.8 m/s^2

Explanation / Answer

here,

1)

torque = force * perpendicular distance

so,

the maximum torque is due to force D

2)

the clockwise torques are C and D

so the answer is b) Two

3)

the direction of the net torque is a) clockwise

4)

as the mass is branched up towards the center

the moment of inertia is decreased

so the angular accelration is increased

so, the angular accelration of the disk is b) larger

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