Question

A stone tied to the end of a string !m long is whirled in a horizintal cirlcle with constant speed. If the stone makes 10 revolutuons in 20seconds. what is the magnitude and direction of acceleration?

Answer 1

given : 10 rev. in 20 sec. i.e 10/20 rev. per sec. which is freq.
and acc. is r(angular vel.) ^2
angular vel. = 2 × 3.14 × freq.

direction will be towards center..