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28 April, 01:26

7. A stereo is able to convert 20% of its electrical energy into sound. If 1000 J of sound energy is produced, calculate the electrical energy used [Show all work].

8. A vehicle is only 18% efficient. How was the other 82% of the energy lost?

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  1. 28 April, 01:41
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    As 20/100 E = 1000

    E = 10,000/2

    =5000J
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Home » Physics » 7. A stereo is able to convert 20% of its electrical energy into sound. If 1000 J of sound energy is produced, calculate the electrical energy used [Show all work]. 8. A vehicle is only 18% efficient. How was the other 82% of the energy lost?
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