Question

milas phone started playing music again when plugged into the battery pack because the battery pack supplied additional electrical chemical energy. the phone had some residual energy (as shown by its ability to resume operation when connected to an external power source), and the combination of its own residual energy and the energy from the battery pack was sufficient for it to start playing music.
1c. after mila plugged her phone into the battery pack, did the amount of energy in the battery pack increase, decrease, or stay the same? explain why.

Explanation:

Step1: Analyze energy transfer

When the phone is plugged into the battery pack, the battery pack supplies energy to the phone.

Step2: Determine energy change

Since energy is being transferred from the battery pack to the phone, the amount of energy in the battery pack decreases.

Answer:

The amount of energy in the battery pack decreases. Because the battery pack supplies energy to the phone.