What energy change happens when the toaster to the right is plugged in?
a. Electrical energy turns into chemical energy
b. Light energy turns into electrical energy
c. Electrical energy turns into potential energy
d. Electrical energy turns into thermal energy

D.

Explanation:

First, a toaster uses electrical energy. Then, it uses this electrical energy and the mechanical energy of you pushing on the lever to produce thermal energy, or heat, and sound as the object in the toaster pops up.

this allows people to make the best decision or pursue the best option. when alternatives are weighed using their advantages and disadvantages, the option whose disadvantages outweigh the advantages (based on a qualitative or quantitative analysis) are shunned while those whose advantages outweigh their disadvantages are pursued.  

resonant frequency