A fire engine must lift 30 kg of water a vertical distance of 20 m each second. What is the amount of power needed for the water pump for this fire hose?

600Watts

Explanation:

Power is defined as the rate of change in work done and work is said to be done if a force is applied to cause an object to move through a distance.

Mathematically Power = Work done/Time

Since work done = Force × Distance

Power = Force × Distance/Time

Given mass = 30kg

Force = ma = 30×10 = 300N

Distance = 20meters

Time = 1second

Substituting this values in the formula we have;

Power = 300×20/1

Power = 600Watts or 600J/s

Therefore, the amount of power needed for the water pump for this fire hose is 600Watts

explanation:

earth's surface is mainly heated by the absorption of infrared radiation from the sun.

evaporation occurs because molecules in liquid water are warmed ( usually by the sun) and vibrate quicker, becoming less dense and rise.

condensation occurs because molecules in water vapor are cooled and therefore vibrate more slowly thus becoming more dense and eventually fall to earth.

lines of equal barometric pressure on a weather map are called: isobars : lines of equal temp on a weather map are called: isotherms.​

the answer is a)

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