Nuclear fusion takes place in the center, or core, of the Sun. Temperatures there can reach 15,000,000 °C. Express this temperature in Kelvin.

In all trials, the magnitude of the final velocity for g1 + g2 was less than the magnitude of any initial velocity. as mass increased, what happened to the velocity? the velocity decreased. the velocity increased. the velocity of g1 + g2 could not be measured. the velocity was not affected by the mass increase.

Positrons are spontaneously emitted from the nuclei of

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?