Question

"An external heat source supplies heat to a system at a rate of 187 W as the system does work at a rate of 131 W. At what rate is the internal (thermal) energy of the system changing?"

Answer 1

Answer:

U = 56 W

Explanation:

given,

Heat supplied to the system = 187 W

Work done by the system = 131 W

the internal (thermal) energy of the system changing = ?

By first law of thermodynamics

  U = Q - W

 Q is the heat supplied

 W is the work by the system

  U = 187 -  131

  U = 56 W

Hence, the rate of change of internal energy is equal to 56 W

Answer 2

Internal energy is the sum of all energy in the system. The rate of change of internal energy is 56 W.

 

From first law of thermodynamics,  

U = Q - W

Where,

U - Internal enrgy of the system = ?

Q - heat supplied = 187 W  

W - work by the system = 131 W

Put the values in the equation,  

U = 187 -  131  

U = 56 W

Therefore, the rate of change of internal energy is 56 W.

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