Why does warm air rise during convection?

a. Warm air is thicker.

b. Warm air is less dense.

c. Warm air is more dense.

d. Warm air is more humid.

The potential energy of an object depends on its?

An object that revolves around a planet is called a

Which statement correctly compares the motion of atoms in liquid mercury and solid copper?

Sound travels slower in colder air than it does in warmer air. Make a claim about the effect of air temperature on the speed of sound.

Explain how gravity and friction work to slow down a kicked soccer ball.

The physiological aim of drive reduction theory is

You are caring for a person who was involved in an automobile collision. The woman is complaining of pain in her abdomen, nausea and extreme thirst. She also is breathing rapidly. Which of the following would you suspect?

A fountain of water and steam that erupts from the ground

A heavy rope, 50 ft long, weighs 0.5 lb/ft and hangs over the edge of a building 120 ft high. how much work is done (in ft-lb) in pulling half the rope to the top of the building?

Does adding a neutron to an atom's nucleus makes it an ion?