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This question means that 60 000 J is used usefully (this is used to produce the kinetic energy of the air flow that does the cleaning), so the ratio of useful energy to the total is 60/200 which is 30 percent. This is the efficiency of the device.

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15y ago

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A vacuum requires 200 000 J of energy to clean a carpet. If 60 000 J of energy is actually used to clean the carpet, what is the % efficiency of the vacuum Round your answer to the nearest percent?

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