Question

find power of motor which lift 4 kg water to height of 2m in 10 sec

Answer 1

Answer:

7.64W

• power = work/time
• work = force * displacement
• and, force = mass * acceleration

thus force= 4kg*9.8 ms^-2=38.2N

now, work = 38.2N*2m=76.4N

therefore, power = 76.4N/10s= 7.64W

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Answer 2

Answer:

Power  =   Force  × Displacement

There are many formulaes of power.

Which one of the following is appropriate apply it.        

Explanation:

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