Work, energy and machines

Question 1 of 10

A 5 kg mass is raised through 4 m. What is its gain in potential energy?

Question 2 of 10

A pulley system lifts 800 N with 250 N effort and has VR 4. Its efficiency is

Question 3 of 10

A motor lifts 500 kg through 10 m in 25 s (g = 9.8 m/s²). Its power output is

Question 4 of 10

A lever with the fulcrum between the effort and the load is a

Question 5 of 10

A lever with the fulcrum between the effort and the load, such as scissors, is

Question 6 of 10

A gear of 20 teeth drives a gear of 60 teeth. The velocity ratio is

Question 7 of 10

An inclined plane reduces the

Question 8 of 10

Energy cannot be created or destroyed, only changed from one form to another. This is the principle of

Question 9 of 10

Find the kinetic energy of a 2 kg mass moving at 3 m/s.

Question 10 of 10

A 20-tooth driver gear turns at 300 rpm and drives a 60-tooth gear. How fast does the driven gear turn?