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Which letter explains why no machine is 100 percent efficient. A.Mechanical energy is transformed into thermal energy by friction. B.Mechanical energy is transformed into electrical energy by a spark.
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Which letter explains why no machine is 100 percent efficient.

A.Mechanical energy is transformed into thermal energy by friction.
B.Mechanical energy is transformed into electrical energy by a spark.
C.Thermal energy is transformed into mechanical energy by friction.

User Jeremy Vanderburg
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5.1k points

1 Answer

5 votes

Answer:

A

Step-by-step explanation:

Think about rubbing your hands together- the friciton produces heat

User Xah Lee
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5.2k points
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