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Which best describes the heat that you can feel on the engine of a running car?
The heat is unusable and absorbed by the engine.
The heat is usable and absorbed by the engine.
The heat is unusable and lost to the surroundings.
The heat is usable and lost to the surroundin
please help

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roger48118
The heat is unusable  and  is being lost  to the surrounding -- assuming that the engine has reached operating temperature   and is not increasing or decreasing in temperature. 
Dejanras

Answer is: The heat is unusable and lost to the surroundings.

Gasoline is a mixture  of many different hydrocarbons: alkanes (paraffins), cycloalkanes  and alkenes (olefins).

Balanced chemical reaction of gasoline combustion:

C₈H₁₈ + 25/2O₂ → 8CO₂ + 9H₂O + energy.

One part of energy produced in combustion of gasoline is used for car ungine (kinetic energy) and other part of that energy (in form of heat) is lost to the surronding and engine does not use it.

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