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OpenStudy (anonymous):
A garage door opener has a power rating of 350 watts. If the door is in operation for 30 seconds, how many joules of energy are used? (Hint: Remember that 1 watt = 1 joule/sec)
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OpenStudy (cwrw238):
1 watt = 1 joule per second so energy used = 350 * 30 joules
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