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Q: Find the efficiency of a machine that does 800 joules of work if the input work is 2400 joules?
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How many watts does 2400 joules equal?

To convert joules to watts, you need to know the time over which the energy is expended. Watts are a unit of power, which is energy per unit time. If the time is known, you can use the formula: Watts = Joules / seconds.


How much energyin kilowatt-hoursis transferred when a 2400watt washing machine is used for 60 minutes?

The energy transferred can be calculated by multiplying the power (2400 watts) by the time (1 hour = 60 minutes): Energy = Power x Time. 2400 watts * 1 hour = 2400 watt-hours. To convert watt-hours to kilowatt-hours, divide by 1000: 2400 watt-hours / 1000 = 2.4 kilowatt-hours. Therefore, 2.4 kilowatt-hours of energy is transferred when a 2400 watt washing machine is used for 60 minutes.


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What is the percent increase of 2400 to 2700?

2700-2400/2400= 300/2400=.125 12.5%


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