in summer, it is cooler in the ground floor than in the top floor of a building. it is because the warm air rises up due to convention. why does warm air rises up?

1.what is where an object is located 2. what is how fast an objects speed is changing 3. what is how fast an object is moving

Awind turbine is rotating counterclockwise at 0.5 rev/s and slows to a stop in 10 s. its blades are 20 m in length. (a) what is the angular acceleration of the turbine? (b) what is the centripetal acceleration of the tip of the blades at t=0s? (c) what is the magnitude and direction of the total linear acceleration of the tip of the blades at t=0s?

What is the increase in density of a medium due to wave travel?