When energy is transferred from one part of a system to another, some of the energy is lost during the transfer and cannot be used as it was intended.
Which two sentences describe examples of this?

A. An electric motor heats up as it powers a blender.
B. Wind moves a turbine, generating electricity.
C. Friction between the moving parts of an airplane engine warms
thd'arts as the engine burns fuel.
D. Sunlight strikes a solar panel, generating electricity.
E. Stereo speakers emit sound when powered by electrical energy.

C. Friction between the moving parts of an airplane engine warms the parts as the engine burns fuel

A. An electric motor heats up as it powers a blender

Explanation:

just took the test

- measure reactants precisely. ( first choice)

- stir to the reaction take place. ( second choice)

- wait patiently until the reaction completes. ( fourth choice)

- make sure to recover as much copper as possible. ( last choice)

think about the oscillation of the toy shown in the video. when the toy is at the highest point of its motion, its velocity is zero and its acceleration is negative.