A0.39 kg apple is dropped, earths exerts a force that accelerates at 9.8 m/s^2. if the mass of the earth is 5.98x10^24 kg, what is the magnitude of the earths acceleration

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid

In science and physics what is the standard unit of measure for speed?

Aphase diagram assumes is kept constant.