Question

a refrigerator converts 5kg of water at 40 into 0 in 20 minutes .then its power is

Answer 1

Mass of water is 5kg
Change in temp. = 40°C
Time taken is 20minutes = 20×60 sec
= 1200 sec

Now, H= mc∆T

And heat supplied is the work done.
W=mc∆t

W=5×4.2×40
W=840J

Answer 2

So, Here is your Answer of the question that belongs to calorimetry-

As we know-

Q=ms∆T {∆T-change in temperature}

Q=5000×80×(40℃-0℃)

$Q = 160 \times {10}^{5} \\ = 16 \times {10}^{6} cal \\ = 16 \times {10}^{3} kcal \\ \\ 1kcal = 4.2 \times {10}^{3} joules \\ Q = 4.2 \times 16 \times {10}^{6} joules \\ \\ power = \frac{enegy}{time} \\ power = \frac{4.2 \times 16 \times {10}^{6} }{20 \times 60} \\ = \frac{42 \times 16 \times {10}^{5} }{1200} \\ = 5.6 \times {10}^{4} watt \\ 56kilowatt$
✨✨56 kilowatt is your Answer.