Question

Explain why the energy needed to operate a pump lifting 420kg of water every minute through a heist of 30m is greater than 126000

Answer 1

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Answer 2

Answer:

Explanation:

Because there is a gravitational potential energy, as formula Gpe=mg△h,

m is mass, g is gravity, △h is change in height.

Then Gpe=420kg*10ms^-2*30m=126000J( for g we often use 9.81, but in this case, 10 is fine)

you can also solve this kind of questions by their units, as the unit of energy is J or kgm^2s^-2, then unit of mass is kg, for height is m. There is only a ms^-2 left which must be the acceleration which is gravity of the water.

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