A cooling machine starts cooling the room at the rate of 5 degree celsius per hour. if the temprature of the room is 28 degree celsius. find the number of hours it take to lower down the room temprature to -7 degree celsius.

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Answers

2016-04-11T14:56:36+05:30
T₁ = 28 °C
T₂ =  -7 °C
ΔT = T₂ - T₁ = -7 - 28 = -35° 
v = -5° / h
t = ΔT / v = -35° / -5° = 7 h

Answer: After 7 hours it becoms in the room -7 °C.
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