question: a refrigerator is equipped with a motor that draws 100 w but operates only 25% of the time. What is the cost of operating the refrigerator for 30 days if electricity costs $0.080/kwh?
help me plzzzzzzzzzzzz
2007-03-23 10:36:28 · 2 answers · asked by bambini 1 in Science & Mathematics ➔ Physics
Okay, first you need to figure out how often the refrigerator is actually running. You need to figure out what 25% of thirty days is. Then, you need to figure out how many hours are in those days. Once you have that, you should be able to multiply the cost per kwh by the number of hours the fridge is actually running. Have fun with your homework.
2007-03-23 10:44:25 · answer #1 · answered by gilgamesh 6 · 0⤊ 0⤋
100w * .25 * 30 days * 24 hours/day *$.08 / 1000wh
or $1.44
2007-03-23 17:44:05 · answer #2 · answered by Matthew P 4 · 0⤊ 0⤋