Thomas needs to move an 80 kg rock, but cannot lift it. He decides to use a
lever to move it and applies 200N of force to the rock. What is the MA of
the lever? (you may use 'io for the value of gravity when solving for this
problem...don't forget resistance force is equal to weight or mass times
gravity) *

4

Explanation:

The weight of the rock is W = mg = (80 kg) (10 m/s²) = 800 N.

The mechanical advantage is therefore 800 N / 200 N = 4.

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27