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Q.

A uniform rod of length 1m and mass 4kg is supported on two knife - edges placed 10 cm from each end. A 60N weight is suspended at 30cm from one end. The reactions at the knife edges is

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a

55 N, 45 N

b

60 N, 40 N

c

65 N, 35 N

d

75 N, 25 N

answer is C.

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Detailed Solution

Question Image

FA + FB = 60 + 4 × 10 = 100 

Taking moments about center ‘o’ 

20 x 60 + 40 x FA = 40 x FB 

2FB – 2FA = 60

FB – FA = 30 

FB + FA = 100

2FB = 130 

FB = 65N ; FA = 35N

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