Which of these describes how heat is transferred by convection? a.) warm air rises and takes heat with it; eventually it cools and sinks. b.) air molecules touch the warm ground; heating them up. c.) sunlight travels through space without the aid of fluids or solids. d.) land and ocean absorb and re-emit heat from the sun.

Aquarterback pedals 3.3meters southward and then run 5.7meters northward. whats the distance ? and whats the displacement?

Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedes’ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.

What is the power rating of the lightbulb if 3.0 a flow through it when connected to a 15 v battery