Question

A 50 cm uniform ruler is freely pivoted at 15 cm mark which balances horizontally
when an object of weight 40 dyne is hung from the 2 cm mark. Draw a diagram of
the arrangement and calculate the weight of the ruler. Also calculate the force
with which pivot is pressed

Answer 1

Answer: 52 dyne

92 dyne

Explanation: 40×30=w×10

W=52 dyne

52 dyne+40 dyne =92 dyne

Answer 2

Answer:

in equilibrium

w1 L1 =w2 L2

[principle of moments]

40*13=W2* 10

w2=40*13/10

4*13

52dyne.