2. a) A disc rotates about its axis at speed 25 revolutions per minute and takes 15 s to stop. Calculate the i) angular acceleration of the disc.
ii) number of rotation of the dise makes before it stops.

This question is worth 54 points ! rock falls from a ledge to the ground what energy conversion occurs during this process a potential to kinetic b kinetic to potential c thermal to mechanical d chemical to mechanical

If a simple machine reduces the strength of a force, what must be increased?

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.