Energy can be transferred from a closed system to the surroundings by: (a) internal chemical reactions (b) heat (c) shaft work (d) change in pressure without changing volume (e) mass transfer

option the correct is B

Explanation:

Let's analyze the different options, for a closed system

- an internal reaction changes the system, but does not affect the surrounding environment

- Heat, is a means of transfer that occurs when two bodies are in contact, one of the body can be a closed system since the only thing that happens is thermal transfer, without movement of the system itself. This is the correct result.

- Work implies a movement whereby the system must be mobile, it is not an option

- Pressure change. change in the system, but does not affect the environment

- Mass transfer is not possible in a closed system

After analyzing each option the correct one in B

muscle endurance

explanation:

i can do 50 in a row ( but i get so tired after that)

wavelength divides in half and speed stays the same.