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100 kJ of energy is introduced to your cell phone while it charges but 10 kJ of energy is lost in the process as heat given off to the surroundings. What is ΔE for the system?

Question

100 kJ of energy is introduced to your cell phone while it charges but 10 kJ of energy is lost in the process as heat given off to the surroundings. What is ΔE for the system?

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Solution

The change in energy (ΔE) for the system can be calculated by subtracting the energy lost from the energy gained.

Step 1: Identify the energy gained by the system. In this case, it is 100 kJ.

Step 2: Identify the energy lost by the system. In this case, it is 10 kJ.

Step 3: Subtract the energy lost from the energy gained to find the change in energy.

So, ΔE = Energy gained - Energy lost ΔE = 100 kJ - 10 kJ ΔE = 90 kJ

Therefore, the change in energy for the system is 90 kJ.

This problem has been solved

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