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Q. How many kWh of energy does a 550-W toaster use in the morning if it runs for a total of 6.0 minutes? At a cost of 9.0 cents per kWh, estimate how much more your electric bill would be over a four-week period if you made toast four mornings per week.

Q. How much work did the movers do (horizontally) pushing a 150-{rm kg} crate 10.6 m across a rough floor without acceleration, if the effective coefficient of friction was 0.50?

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