AnswersTX-Physics CRFirst Law of Thermodynamics — Unit testQuestion 4
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First Law of Thermodynamics — Unit test

Question 4 • TX-Physics CR

A steam turbine is a device in which high-pressure steam enters the turbine and causes blades to spin. The spinning blades have mechanical energy.

Answer
A
The turbine absorbs heat, which creates kinetic energy in the system and produces work to turn the blades.
B
The turbine destroys some of the thermal energy in the steam, which generates work and turns the blades.
C
The turbine generates heat from the steam, and some of the heat creates work and turns the blades.
D
Some of the heat used to make the steam is transformed into work as the steam pushes against the blades to make them turn.

Explanation

As high-pressure steam expands through the turbine, it transfers energy to the blades and makes them turn. Some of the thermal energy supplied to produce the steam is converted into mechanical work. Choice D describes this energy transformation; energy is not destroyed, as choice B suggests.

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