Question

4. A uniform metre scale is balanced at 35 cm mark when
weights of 50 gf and 20 gf are suspended at 5 cm mark and
80 cm mark respectively. Calculate the weight of the metre scale​

Answer 1

Answer:

A metre scale is uniform, therefore its weight acts at 50 cm mark.

Taking moments about to cm mark.

Moment in clockwise direction,

= W x 10 cm + 5 gf x 35 cm

= 10 W cm + 175 cm gf cm.

Moment in anti-clockwise direction, = 20gf x 35 cm = 700 gf cm.

By the law of moments,

Moments in clockwise direction = Moments in anti-clockwise direction.

10 W cm + 175 gf cm = 700 gf cm

∴ 10 W cm = (700 - 175) gf cm

∴ W = 525/10 gf = 52.5 gf.

Explanation:

Answer 2

Answer:

50

Explanation: