Question

What is the IMA of a lever whose resistance arm is 5 cm long if the effort arm is 0.5 m long and the load is 9.20 N?

a)0.1
b)0.9 N
c)10
d)90 N

Answer 1

The Ideal Mechanical Advantage (IMA) of a lever is the ratio between the length of the effort arm and the length of the resistance (load) arm:
$IMA=\frac{L_e}{L_r}=\frac{50}{5}=10$

Correct answer c) 10

Notice that I've transformed the effort arm from 0.5 meters in 50 cm, to match the unit with the resistance arm.