The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into
select one:
a. work
b. heat
c. input force
d. output force

What is an electric motor? explain its operation. 2-3 sentence

Match each type of lever with the correct diagram. 1. first-class 2. third-class 3. second-class

Vi. on another planet, a spring with constant 4.7 n/m is set up and allowed to expand verticaly freely. 8.4kg mass is placed on the spring and the spring extends 5.28m. calculate the exected extension on earth.