Question

Water in a bucket is whirled in a vertical circle with a string attached to it. The water does not fall down even when the bucket is inverted at the top of its path. We: conclude that in this position

(a) mg = mv²/r

(b) mg is greater then mv²/r

(c) mg is not greater than mv²/r

(d) mg is not less than mv²/r.

Answer 1

(c) mg is not greater than mv²/r

Explanation :

At the top position the weight of the water mg acts downward to bring it down while due to inertia water tries to escape upward with a force mv²/r on the bucket. Therefore if the water is not falling at the top position it means mg< mv²/r.