A steam engine receives 300 kJ of heat from its environment and does 400 kJ of work. How much does the energy of the steam engine change?

Answer 1

Energy of system is decreased by #"100 kilojoules"#

Form 1st law of thermodynamics

#"dU = dQ + dW"#
#"dU = 300 kJ + (-400 kJ)"#

[Work is done by the steam engine. Hence i took -400 kJ]

#"dU = -100 kJ"#
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Answer 2

The change in energy of the steam engine can be calculated using the First Law of Thermodynamics:

Change in energy = Heat input - Work done

Given: Heat input = 300 kJ Work done = 400 kJ

Change in energy = 300 kJ - 400 kJ Change in energy = -100 kJ

Therefore, the energy of the steam engine decreases by 100 kJ.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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