Question

a uniform beam of length l and mass m is equals to 1.8 kg rests with its end on two digital scales.A uniform block whose mass is equals to 2.7 kg rests on the beam.its centre being at the distance l/4 from the beam left end. What do the scales read​

Answer 1

Answer:

Let the Force experienced by left scale is F(L) and by right if F(R)

=>F(L) + F(R) = 2.7g + 1.8g

=>F(L) + F(R) = 4.5g --------------------(i)

By taking torque at center:-

=>F(L) x L/2 = F(R) x L/2 + 2.7g x L/4

=>F(L) = F(R) + 1.35g --------------(ii)

=>BY(i):-

=>F(R) + 1.35g + F(R) = 4.5g

=>F(R) = 1.58g = 1.58 x 9.8 = 15.44 Newton

BY (ii) :-F(L) = 2.93g = 28.67 Newton