Question

A 50 meter chain with uniform density and a mass of 40 kilograms is hanging from the roof of a building under construction. How much work (in Nm) is required to pull the chain up?

Answer 1

19,600 Nm

Explanation:

WD = mgh

= 40 × 9.8 × 50

= 19600 Nm

Answer 2

W = 19600 N m

Explanation:

W = force * distance

The force is the weight times gravity since it is hanging down

W = 40 kg* 9.8 m/s^2 * 50m

19600 kg m^2/s^2

A newton is kg m/ s^2

W = 19600 N m