Question

In what type of system is mechanical energy lost to its surroundings?

A. internal

B. external

C. closed

D. open

help.

Answer 1

If you consider systems as internal, external, or open then energy can only be exchanged between systems that are classified as -

(D) open

For instance if you want to classify the work done in lifting a bucket of water from a well, then this is an internal system as opposed to a system where you would have to consider the work done on the earth and its surrounding stars.