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How many calories of heat is developed by 200 watt bulb in 5 minutes?

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a

1.43×103 cals

b

1.43×104 cals

c

14.3×103 cals

d

14.3×104 cals

answer is B.

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Detailed Solution

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 cal

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How many calories of heat is developed by 200 watt bulb in 5 minutes?