A50-kg skier waits at the top of a 100 m high hill to ski down the hill. whats the skier’s gravitational potential energy?

The freezing and boiling point of a substance changes as the air pressure around it changes. for example, at a lower air pressure (higher altitude) it is easier for water molecules to escape from liquid into the air. in a high altitude city such as denver, colorado compared to a sea-level city such as houston, texas, water

Which sound characteristic is not affected by the relative motion of an object

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?