A) Which of the following does not represent unit of energy?a. Nm b. J

1.	A) Which of the following does not represent unit of energy?a. Nm b. J c.W/s d.kgm2s-2b) In a staircase running race, John of weight 600 N takes 1 minute 20 seconds to run up a 20-storey building. The height of each storey is 3 m. Estimate the average power developed by John. Take g = 10 m /s/s.
Answer» a) W/s it is not the UNIT of ENERGY cause it is the unit of power all the other units are units of energy as well as work work = energy b) Power = W/t W = F s W = mgh F = ma a = g m = F/a = 60 x 10 x 20 x 3 1 min 20 sec = 80 sec P = 60 x 10 x 20x 3 / 80 = 36000/80 = 450W hope it helps...

A) Which of the following does not represent unit of energy?a. Nm b. J c.W/s d.kgm2s-2b) In a staircase running race, John of weight 600 N takes 1 minute 20 seconds to run up a 20-storey building. The height of each storey is 3 m. Estimate the average power developed by John. Take g = 10 m /s/s.

Answer»

a) W/s

it is not the UNIT of ENERGY cause it is the unit of power

all the other units are units of energy as well as work

work = energy

b) Power = W/t

W = F s

W = mgh

F = ma

a = g

m = F/a

= 60 x 10 x 20 x 3

1 min 20 sec = 80 sec

P = 60 x 10 x 20x 3 / 80

= 36000/80

= 450W

hope it helps...

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A) Which of the following does not represent unit of energy?a. Nm b. J c.W/s d.kgm2s-2b) In a staircase running race, John of weight 600 N takes 1 minute 20 seconds to run up a 20-storey building. The height of each storey is 3 m. Estimate the average power developed by John. Take g = 10 m /s/s.

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