1) A compact disk player has just been turned off. A disk decelerates uniformly

Question

1) A compact disk player has just been turned off. A disk decelerates uniformly from an initial angular velocity of 7.60 rev/s. The disk rotates through 2.75 revolutions before coming to rest. What is the tangential acceleration of a point on the disk 4.30 cm from the axis?

2.)A heavy concrete panel is being lifted into position in a building by means of a crane (see figure below). The tension of 2.02 104 N in the supporting cable produces a torque with respect to point O. (Let L = 45.3 m.) Theta= 53.0. Find the torque.

Explanation / Answer

1)f^2=i^2+2** and f=0 rad/sec because it goes to stop and i=7.6*2* (given but converted to rad/sec) and =2.75*2* so 0=7.6*2*+2*(2.75*2*) so =-1.4 m/s^2.

2) I can't exactly say without the picture. Can you possibly upload the picture or include more details?

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