Why does a solid change to liquid when heat is added?
A.
The spacing between particles decreases.
B.
Particles lose energy.
C.
The spacing between particles increases.
D.
The temperature decreases.

According to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does maria's voyage take according to samir?

According to the image below, which season is about to begin in the southern hemisphere? a. summer b. autumn c. winter d. spring

Derive the formula 2as=v² -u² where the formula have have usual meanings