3. A heat engine does not convert all of the heat that flows through it into mechanical energy. Which statement explains this fact? All heat engines must discard waste heat, which is not converted to mechanical energy. A fraction of the input energy is trapped as internal energy during each cycle of the heat engine.

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3. A heat engine does not convert all of the heat that flows through it into 2
mechanical energy. Which statement explains this fact? *
All heat engines must discard waste heat, which is not converted to mechanical
energy.
A fraction of the input energy is trapped as internal energy during each cycle of the
heat engine.
At least half of the input energy is lost to friction.
F6
F7
F8
F9
F10
F11
F12
&
6
7
8
Y
U
Transcribed Image Text:3. A heat engine does not convert all of the heat that flows through it into 2 mechanical energy. Which statement explains this fact? * All heat engines must discard waste heat, which is not converted to mechanical energy. A fraction of the input energy is trapped as internal energy during each cycle of the heat engine. At least half of the input energy is lost to friction. F6 F7 F8 F9 F10 F11 F12 & 6 7 8 Y U
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