50J of energy is transferred as work is done on the system. 30J of heat is also absorbed by the system. Calculate the change in internal energy.
20
not understand
To calculate the change in internal energy, we can use the first law of thermodynamics, which states that the change in internal energy of a system is equal to the heat added to the system minus the work done by the system.
Change in Internal Energy = Heat Added - Work Done
Given:
Heat added (Q) = 30J
Work done (W) = 50J
Using the formula:
Change in Internal Energy = Q - W
Substituting the given values:
Change in Internal Energy = 30J - 50J
Calculating:
Change in Internal Energy = -20J
Therefore, the change in internal energy of the system is -20J.
To calculate the change in internal energy, we need to consider the first law of thermodynamics, which states that the change in internal energy of a system is equal to the heat added to the system minus the work done by the system.
Therefore, we can calculate the change in internal energy using the formula:
ΔU = Q - W
Where:
ΔU = Change in internal energy
Q = Heat absorbed by the system
W = Work done on the system
In this case, the heat absorbed by the system (Q) is given as 30J, and the work done on the system (W) is given as 50J.
ΔU = 30J - 50J
ΔU = -20J
Therefore, the change in internal energy (ΔU) is -20J. The negative sign indicates that the internal energy of the system has decreased by 20J.