Please help I really don’t understand. I just need someone to help explain. Maybe walk me through it.

After a car's engine has been running for a while, if you stand near the car's engine you can often feel heat coming from the engine as a result of a. radiation b. convection c. conduction

Aplane travels 1000 miles in 5 hours .what is the planes average speed?

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