A woman sits stationary with her feet up on a stool that is free to rotate. (a)

Question

A woman sits stationary with her feet up on a stool that is free to rotate. (a) If she twists her body suddenly to the left, she and the chair will rotate continuously to the right. (b) She will not be able to cause continual motion of the stool rotation regardless of how she moves her body. (c) If she twists her body suddenly to the right, the chair will rotate continuously to the right. (d) She will begin to rotate if she keeps her arms close to her body. you throw a tennis racquet spinning into the air. (a) The racquet always spins about a "special point" (b) The "special point" is determined by how you spin it. (c) The racquet spins in a random way depending on how throw it. (d) It moves in an unpredictable way. A 60 lb child and a 40 lb child can balance on a seesaw if (a) The 40 lb child sits closer to the pivot point. (b) The downward forces they exert on the seesaw are equal. (c) The torques they exert on the seesaw are equal and opposite. (d) the lever arms are equal. Carrying a long pole helps a tightrope walker to maintain balance because. (a) It lowers the center-of-mass of the tightrope walker. (b) Of the long lever arm. (c) It decreasing the torque on the tightrope walker. (d) Of the large rotational inertia of the pole.

Explanation / Answer

3.

Torque is given as

T = F r                      F = weight , r = distance from point of rotation

for larger mass or weight , the distance from point of rotation would be smaller ,so as to have equal torques

so correct choice is C)

4)

the pole increases the rotational inertia of the system with its large rotational inertia

d)

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