An uncharged object becomes charged without direct contact. What method of charging is occurring?

The differences between  a compression wave and a transverse wave?

According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?

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