A disk rotates about a vertical axis through its center. Point P is midway betwe

Question

A disk rotates about a vertical axis through its center. Point P is midway between the center and the rim of the disk, and point Q is the rim. If the disk turns with constant angular velocity. which of the following statements about it are true? (They may be more than one correct choice.) A) P and Q have the same linear acceleration. B) Q is moving twice fast as P. C) The linear acceleration of Q twice as great as the linear acceleration of P. D) The linear acceleration of P twice as great as the linear acceleration of Q. E) The angular velocity of Q is twice as great as the angular velocity of P. As you are leaving a building, the door opens outward. If the hinges on the door are on your right, what is the direction angular velocity of the door as you open it? A) up B) down C) to your left D) to your right E) forwards A stock person at the local grocery store has a job consisting of the following five segments: (1) picking up boxes of tomatoes from the stockroom floor (2) accelerating to a comfortable speed (3) carrying the boxes to the tomato display at constant speed (4) decelerating to a stop (5) lowering the boxes to the floor. During which of the five segments of the job does the stock person do positive work on the boxes? A) (1) and (5) B) (1) only C) (1), (2), (4), and (5) D) (1) and (2) E) (2) and (3) Two objects, one of mass m and the other of mass 2m, are dropped from the top of a building. When they hit the ground A) both of them will have the same kinetic energy. B) both of them will have twice the kinetic energy of the lighter one. C) the heavier one will have four times the kinetic energy of the lighter one. D) the heavier one will have four times the kinetic energy of the lighter one. If a force always acts perpendicular to an object's direction of motion, that force cannot change the object's kinetic energy. A) True B) False A bicycle does not fall down sideways at high speeds because a) The conservation of angular momentum b) The conservation of mechanical energy c) Newton's first law d) the inertia of the wheel is so great that it will not fall

Explanation / Answer

here,

5)

P is on the midway beyween rim and center

and

Q is at the rim

so,

the tangential speed , v = r * w

r-> the distance from the center

so,

B) Q is moving twice as fast as P

so the corect option is B

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