PHYSICS PROBLEM plaese help!?

[Reverend Mimal]

The human arm uses a lever principle. If the muscle is attached 6.0 cm from the joint (elbow) and a 2.0 kg ball is held in the hand 36 cm from the joint, what is the vertical force supplied by the muscle?

[vidkid1990]

This is simple torque.

First, you need to convert the 2.0 kilograms to weight.

2kg x 9.8m/s/s = 19.6 Newtons.

On either end of the lever, you need the same number of Newton-meters.

On one end, we have 19.6 Newtons at 0.36m (36cm), which is 7.056Nm.

On the other end, we have x Newtons at 0.06m, which is 0.06xNm.

Divide both sides by 0.06m, and we get 117.6 Newtons.