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How long does a 75kW motor take to extract 400m³ of water from a depth of 150m?

53.33 seconds

Explanation:

From the question;

We are required to determine taken to raise the water from the given height.

We know that density of water is 1000 kg/m³

Therefore;

Mass of water = 400 m³ × 1000 kg/m³

                       = 4.0 × 10^5 kg

Thus, force required to raise the water;

 = 4.0 × 10^5 kg × 10 N/kg

  = 4.0 × 10^6 N

To determine the time;

we use the formula;

 Time = work done ÷ power  

          = (4.0 × 10^6 N × 150 m) ÷ 75000 Joules/s

          = 53.33 seconds

Therefore, time taken to raise the water is 53.33 seconds

scientific laws are the result of testing theories and proving them to be facts.

according to jean piaget, in what stage of cognitive development are children able to understand conservation task?

b. preoperational

just took it