Roger drives his car at a constant speed of 80 km/hr. How far can he travel in 2 hrs. and 30 minutes?

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

Convection currents are caused by differences in what two things?

Astudent pushes a 60-n block across the floor for a distance of 10 m. how much work was done to move the block