a uniform metal rod of length 80cm and mass 3.2kg is supported horizontally by two vertical spring balances at C and D. Balance C is 20cm from one end while balance D is 30cm from the other end. find the reading on each balance.

3 answers

64n

When pivot at C:
Then C.M = (30 x 32) Ncm
A.C.M = 50D
C.M = A.C.M => 960/50 = 50D/50
D = 19.2N
C + D = 32N
C = 32 – 19.2
= 12.8N
Reading on C = 12.8N
Reading on D = 19.2N

yeah

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