1. A kilowatt hour (kWhr) is a unit of energy equal to 1000 J=s times one hour.

Question

1. A kilowatt hour (kWhr) is a unit of energy equal to 1000 J=s times one hour. (note that a Watt is a Joule per second). Find the conversion between kWhr and Joules. 2. A dietary Calorie is actually a kilocalorie (note that by convention a capital 'C' is always used to indicate a dietary calorie and a lower case 'c' is used otherwise). Given that 1 cal = 4:186 J express the average daily dietary intake of a person in terms of Joules. 3. In the movie Raiders of the Lost Ark, Indiana Jones attempts to fool a booby trap by replacing a golden statue with a bag of sand of roughly equivalent size. Assuming that the statue was about twice the size of a 12oz can (in both height and diameter) of pop, then calculate the mass of both the gold statue (ZAu  19:3 gcm-3) and the bag of sand (Zsand  1:3 gcm-3). Given that 1 kg weighs about 2:2 lb comment on the believability of this particular scene and comment on whether you think the substitution of the sand for the gold would realistically fool the booby trap.

Explanation / Answer

1kWhr=1000*3600J/s 1kWhr=3.6*10^6 J/s too many questions in one with no relation ask differently

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