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A uniform beam PQ of length 80 cm and weight 60 N rests o...

A uniform beam PQ of length 80 cm and weight 60 N rests on a support at X where | PX | = 30 cm. If the body is kept in equilibrium by a mass m kg which is placed at P , calculate the value of m
[Take g = 10 ms2]

A.

2.0

B.

3.0

C.

2.5

D.

4.0

Correct answer is C

∑ clock wise moments =∑ anti clock wise moments

= 60 x 10 = 30 x m

= 600 = 30 m

m = 60030=20N

W = mg ==> m = Wg

∴ m = 2010=2kg