Question

Automobile engines contain cooling systems that transfer thermal energy from the engine to the environment. Without a cooling system, how would
the temperature of the engine be affected as its operating speed increases?

A The temperature would increase
B The temperature would decrease
C The temperature would stay the same

Answer 1

When the engine's operating speed increases the temperature of the engine will also increase.

Given:

Automobile engines without a cooling system.

To find:

The affect on the temperature of the engine as its operating speed increases.

Solution:

The speed of the operating engine increases.

• As we know that kinetic energy of the object and motion of the object is directly proportional to each other.

Velocity of object ∝ Kinetic energy of object...[i]

• When the kinetic energy of the object increases the kinetic energy of the particles of the object also increases.

• And kinetic energy of the particles is directly linked to the temperature of the object.

Kinetic energy  ∝ Temperature of object...[ii]

From [i] and [ii] :

Velocity of object ∝  Temperature of an object

• When the engine's operating speed increases it will increase the kinetic energy of its particles and with that increase, the increase in the temperature of the engine will be observed.

So, from this, we can conclude when the engine's operating speed increases the temperature of the engine will also increase.

Learn more about kinetic energy and temperature here:

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