Question

Question -9
Water falls from a height of 20m at a rate of 100kg/s. How many calories of heat will be
per second on striking with the earth? Assume that the whole energy is converted into
Question-10​

Answer 1

Question  :

• Water falls from a height of 20m at a rate of 100kg/s. How many calories of heat will be  per second on striking with the earth? Assume that the whole energy is converted into heat.

Given :

• Rate of mass falling (m)= 100 kg / s
• Height (h) = 20 m
• Acceleration due to gravity (g) = 10 m/s²

Loss in potential energy when the water strikes the earth

→ PE = m gh

→ PE = 100 x 10 x 20

→ PE = 20,000 J

Now , as per the question the energy produced is converted into heat .

→ H = PE = 20,000 J

we know that ,

→ 1 Cal = 4.18 J

Hence ,

→ H = 20,000 / 4.18

→ H = 4784.6 Cal

Hence , 4784.6 Cal of heat will be  per second on striking with the earth.

Answer 2

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Refer to the attachment.

• Hope it helps

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