The second hand on a clock completes one revolution each minute. What is the dir

Question

The second hand on a clock completes one revolution each minute. What is the direction of the angular velocity (omega vector) of the second hand as it passes the "12" at the top of the clock? a. Up (toward the "12"). b. Horizontal, to the right (toward the "3"). c. Down (toward the "6"). d. Outward from the face of the clock. e. Into the face of the clock. A hollow cylinder of mass M and radius R rolls (with negligible friction) down an incline plane A block with the same mass M slides (with negligible friction) down an identical incline plane. If both objects start from rest at the same place and time... a. the block always reaches the bottom first. b. the cylinder reaches the bottom first, but only for selected values of R. c. the block and the cylinder always reach the bottom at the same time. d. the block arrives at the bottom with the greater kinetic energy. e. the cylinder arrives at the bottom with the greater kinetic energy. A 2.0-kg hoop rolls without slipping on a horizontal surface so that its center proceeds to the right with a constant linear speed of 6 0 m/s. What is the total kinetic energy of the hoop? 16 A uniform rod AB is 1.2 m long and weighs 16 N. It is suspended by strings AC and BD as shown. A block P weighing 96 N is attached at E, 0.30 m from A. The magnitude of the tension force in the string BD is... a 36 J b. 54 J c. 72 J d 96 J e. 140 J a. 8 N b. 24 N c. 32 N d. 48 N e. 80

Explanation / Answer

13.

As the hands in the Clock move in Clockwise Diretion

and at 12, Angular velocity will be pointed OUWARDS

option Dit is

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14.

this depends on the MOI oof the objct under moton

MOI of Cylinder is 0.5 MR^2

and m MOI of Block = mR^2

so here the answer would be

option E.

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15. Total KE = 0.5 mv^2

KE = 0.5 *2* 6*6

KE = 36 J

otpion A

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