Which sound has 1000 times more energy than the sound of a dishwasher?
a. chain saw (100 dB)
b. jackhammer (130 dB)
c. a lawnmower (90 dB)
d. tornado siren (140 dB)

Kate is working on a project in her tech education class. she plans to assemble a fan motor. which form of energy does the motor convert most of its electric energy into? a. light energy b. motion energy c. sound energy d. thermal energy

What is the orbital period of a spacecraft in a low orbit near the surface of mars? the radius of mars is 3.4×106m.

What happens to an isotope during radioactive decay?