12. A crane lifts a 100-kg mass a height of 20 m in 5 s. Calculate (a) the work done by the crane, in SI units, (b) the increase of potential energy of the mass, in SI units, (c) the power, or rate of doing the work, in SI units.
12. A crane lifts a 100-kg mass a height of 20 m in 5 s. Calculate (a) the work done by the crane, in SI units, (b) the increase of potential energy of the mass, in SI units, (c) the power, or rate of doing the work, in SI units.
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Transcribed Image Text:12. A crane lifts a 100-kg mass a height of 20 m in 5 s. Calculate (a) the
work done by the crane, in SI units, (b) the increase of potential energy
of the mass, in SI units, (c) the power, or rate of doing the work, in SI units.
13. Calculate the voltage of a battery if a charge of 3 x 10-4 C residing
on the positive battery terminal possesses 6 x 10-² J of energy.
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