Question

8. What minimum horizontal speed should be given to the
bob of a simple pendulum of length I so that it describes
a complete circle ?
speed un​

Answer 1

Answer:

v′=5gl

Explanation:

To complete the circle , at the highest position tension in string is zero .now we proceed

⟹mg=lmv2     at the highest position

⟹v2=gl

now at the lowest position

apply conservation of energy

⟹21mv2+mg.2l=21mv′2

⟹v′2=5gl⟹v′=5gl

where v'is velocity of bob at lowest position which should be given to the  bob to complete the circle