A uniform meter rule QR is balanced on a knife edge which is 55cm from R, when a mass of 10g is hung at P as shown above, the mass of the meter rule is

ThankGodNwaoha

7 years ago

Note the centre gravity of the uniform metre rule=50cm,,,and the pivot ie the Knife edge is at 55cm frm R,,,,,sotherefore
using principle of moment(clockwise=anticlockwise)
10x(55-20)=mx(55-50)
350=5m
350/5=m
m=70g

uniquelyPrecious

1 year ago

the explanation is not available