A machine has a velocity ratio of 6 and is 80% efficient what effort would be needed to lift a load of 3000N with the aid of a machine

The effort needed to lift a load of 3000N with the aid of a machine with a velocity ratio of 6 and 80% efficiency is 2400N.

This can be calculated using the equation: Effort = Load / (Velocity Ratio x Efficiency).

Therefore, Effort = 3000N / (6 x 0.8) = 2400N.

Effort = 3000N / (6 x 0.8) = 625 N