Work, energy and machines

Question 1 of 10

A motor does 600 J of work in 5 s. What is its power?

Question 2 of 10

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

Question 3 of 10

A wheelbarrow is an example of a

Question 4 of 10

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

Question 5 of 10

Efficiency of a machine is always less than 100% because of

Question 6 of 10

A motor does 6000 J of work in 2 minutes. Its power is

Question 7 of 10

Work done = force × distance moved

Question 8 of 10

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

Question 9 of 10

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

Question 10 of 10

A pulley system with a velocity ratio of 4 lifts an 800 N load with an effort of 250 N. What is its efficiency?