Question

The rod of mass 2kg and length 10cm is free to rotate about a horizontal axis passing through one of its ends. If the rod is released in the horizontal position then the maximum angular speed of the rod attained, in rad/sec is

Answer 1

Answer:

The rod will rotate about the end A.

A

. The rod is kept in the horizontal position by a massless string tied at point

Let a be the linear acceleration of COM of rod and α be the angular acceleration.

α=

I

τ

=

3

ml

2

mg

2

l

=

2 l

3 g

a=

2

l

α=

2

l

2 l

3 g

=

4

3g

From force equation:

mg− F= ma

F= mg− m

4

3g

= m

4

g

=

4

20

= 5

Explanation:

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