Question

For a given machine the load moves 2 m when the effort moves 8m,if an effort of 20 N is used to raise a load of 60N, what is the efficiency of the machine

Answer 1

if 100% efficient then 60 *2/8 = 60/4 = 15 N
it actually took you 20 N
100 * 15/20 = 5*15 = 75%

Answer 2

A certain machine has an efficiency of 80%. If the load moves a distance of 2m as the effort moves 8m, how large a force is required to lift a load of 320 New ton

Answer 3

The mechanical advantage of a simple machine is 4.the machine lifts load of 1000 New Ton. What is the force that act's on the machine?