Questions
How many calories of heat is developed by 200 watt bulb in 5 minutes?
a
1.43×103 cals
b
1.43×104 cals
c
14.3×103 cals
d
14.3×104 cals
detailed solution
Correct option is B
Power =Energytime ⇒Energy = Power x time in secondsgiven Power =200 Wtime=5×60 =300s substitute the given values in Energy equationtotal energy = 200×5×60=6×104 J4.2J=1calorie (conversion)1J=14.2calorietotal heat energy developed=6×1044.2cal=107×104caltotal heat energy developed=1.43×104 calTalk to our academic expert!
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An ideal gas expands isothermally from a volume V1 to V2 and then compressed to original volume V1 adiabatically. Initial pressure is P1 and final pressure is P3. The total work done is W. Then
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