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- Tell me? A system is given 400 calories of heat and it does 800 joules of work. How much does the internal energy of the system change in this process (J = 4.18 joules/cal)
- #Birla Institute of Technology & Science Admission Test
- #Engineering
- #Physics
- #Heat and Thermodynamics
A system is given 400 calories of heat and it does 800 joules of work. How much does the internal energy of the system change in this process (J = 4.18 joules/cal)
- Option 1)
2472 J
- Option 2)
872 J
- Option 3)
654 J
- Option 4)
2944 J
Answers (1)
As we discussed in concept
First law of Thermodynamics -
Heat imported to a body in is in general used to increase internal energy and work done against external pressure.
- wherein
Q = 400 cal = 400 x 4.18 J
= 1672 J
W = 800 J
Option 1)
2472 J
This option is incorrect.
Option 2)
872 J
This option is correct.
Option 3)
654 J
This option is incorrect.
Option 4)
2944 J
This option is incorrect.
View full answer
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