A uniform metre rod is capable of turning free about a knife edge at 70 cm mark A mass - Physics -

Question

A uniform metre rod is capable of turning free about a knife edge
at 70 cm mark A mass of 10 g is suspended at 15 cm mark and a mass
of 150 g is suspended at 85 cm mark makes the rod exactly
horizontal Find the weight of the metre rod

Jyoti Pant · Accepted Answer

Suppose the mass of the metre rod is 'm'
According to the conservation of net torque for rotational
equilibrium,
10 g(70-15) +mg(70-50) -150g (85-70)=0550 g+20 mg -2250g=020 mg=2250g-550 g=1700or W=mg=1700 /20=85 gThus, the weight of the rod is 85 g

A uniform metre rod is capable of turning free about a knife edge at 70 cm mark. A mass of 10 g is suspended at 15 cm mark and a mass of 150 g is suspended at 85 cm mark makes the rod exactly horizontal. Find the weight of the metre rod.