Answer: Hot air is less dense than cool air; the heated air causes the balloon to rise simply because it is lighter than an equal volume of cold air. Buoyancy is an upward force that the air exerts, and it helps hot-air balloons and blimps stay in the air. A hot air balloon uses a burner to heat up the air inside the balloon.
Hope this helps!!! Good luck!!! ;)
<u>Answer</u>: C) c
The sun is part of the group of stars calld the <em>Main Sequence</em>. It has an absolute magnitude of approximately 4.83, a temperature of 5778 K a luminosity of 1 L☉ and a spectral class of G-type.
I believe the answer is C.
