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Question
If 100 calories of heat are added to a system and a work of 50 calories is done on the system, calculate the energy change of the system
If 100 calories of heat are added to a system and a work of 50 calories is done on the system, calculate the energy change of the system
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Solution
The correct option is A 150 calories
The first law of thermodynamics can be given by ΔU = q + w
When q is positive, it is the heat added to the system.
When q is negative, it is the heat taken from the system.
When w is positive, it is the work done on the system.
When w is negative, it is the work done by the system.
Heat added to the system q = 100 calories
Work done on the system w = 50 calories
ΔU = q + w = 100 + 50 = 150 calories
150 calories
The first law of thermodynamics can be given by ΔU = q + w
When q is positive, it is the heat added to the system.
When q is negative, it is the heat taken from the system.
When w is positive, it is the work done on the system.
When w is negative, it is the work done by the system.
Heat added to the system q = 100 calories
Work done on the system w = 50 calories
ΔU = q + w = 100 + 50 = 150 calories
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