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In a CD player, a CD rotates from rest up to angular speed of   in a time interval, . It is necessary to calculate:

1. What is the angular acceleration of the disc, assuming the angular acceleration is uniform?

1. The angular displacement and the number of revolutions  done by the CD while coming up to speed?

1. If the radius of the disc is , what are the magnitudes of tangential speed and acceleration of a dust particle placed on the rim of the disc when

A uniform steel beam AB of Weight  is loaded as indicated in the Figure 1 below:

Figure 1.

It is required to determine:

1. The magnitude of the reactions and , in the absence of the external force F.

1. the magnitude of the load F acting at B that makes the reaction force at A to be zero.

1. the magnitude of when F is acting at B.

What is electricity ?