An object that produces light because it has been heated is: translucent.
incandescent.
fluorescent.
transparent.

1= 26.17

2= 1.17

3=30.86

4=5.86

just took the assigment on edge

think its the third option

measure their densities same density, same sub

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me