Calculate the change internal energy (î´e) for a system that is giving off 45.0 kj of heat and is performing 855 j of work on the surroundings.

Change in internal energy is -45855 J.

Given :

Heat, Q = -45 kJ

(Q is negative because heat is released by the system)

Work, W = -855 J

(W is negative because work is done by the system)

Solution :

We know that the change in internal energy is given by,

Therefore change in internal energy is -45855 J.

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.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.