Question

22. The mechanical efficiency of any machine is always ____________________ than 100 percent.

23. When a pole vaulter flexes the pole, the pole vaulter increases the pole’s ____________________ potential energy.

24. Wind turbines convert ____________________ energy into electrical energy.

Answer 1

Explanation :22 The mechanical efficiency of any machine is always less than 100 percent.

23. When a pole vaulter flexes the pole, the pole vaulter increases the pole’s elastic potential energy.

24. Wind turbines convert wind energy into electrical energy.

Answer 2

22. less
23. elastic
24. wind
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