Asystem uses 49 j of energy to do work, and the change in internal energy is 58 j. how much heat was added to the system?
9 j

97 j

107 j

117 j

- 107 J

Solution:- The work done by the system is given as 49 J and the internal energy change is 58 J. It asks to calculate the heat added to the system.

It is based on first law of thermodynamics and the equation used is:

where w is the work done by the system or on the system. q is the heat energy added to the system or released by the system and is the internal energy change.

Since the work is done by the system, the sign of w is negative.

So, w = -49 J

= 58 J

q = ?

Let's plug in the values in the equation:

58 J = q - 49 J

on rearranging this:

q = 58 J + 49 J

q = 107 J

Hence, 107 J of heat is added to the system. Option three is correct.

the leaf is an organ of a typical plant, and the main functions are to complete photosynthesis and allow the plant to exchange gas, just like how we have the respiratory system. leaves have the stomata, which collects maintains co2 and o2 levels. this is necessary for cell metabolism. the leaf also collects sunlight using chloroplasts. succinctly, leaves own a pivotal role in sustaining plant life.

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