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A rod of length 50cm is pivoted at one end, It is raised such that if makes an angle of 30°  from the horizontal as shown and released from rest.  Its angular speed when it passes through the horizontal (in rad s−1 )  will be (g=10ms−2)

a.

 

b.

 

c.

 

d.

 



Question ID - 50132 | SaraNextGen Top Answer

A rod of length 50cm is pivoted at one end, It is raised such that if makes an angle of 30°  from the horizontal as shown and released from rest.  Its angular speed when it passes through the horizontal (in rad s−1 )  will be (g=10ms−2)

a.

 

b.

 

c.

 

d.

 

1 Answer
127 votes
Answer Key / Explanation : (a) -

Work done by gravity from initial to final position is,

     W=mg

=

According to work energy theorem

      W=

 

=

=  rad/sec

∴ correct answer is (a)

127 votes


127