Question

A flying hot air balloon has an upward thrust of 2500N and a weight of 2200N. What is the air resistance acting on the hot air balloon? ​

Answer 1

Answer:

This transfer of heat energy away from the ground by the vertical movement of air is called "free convection" or "natural convection." A hot air balloon rises because warmer air is less dense than cool air. Since the balloon is less dense than the air around it, it becomes positively buoyant.

Explanation:

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Answer 2

Answer:

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Explanation:

There is only one force upon the ball - the force of gravity. (Air resistance is negligible; the ball is not on a surface, so there is no friction or normal force; the applied force which projects it into motion does not act upon the ball during its trajectory; there are no springs, strings, wires, or cables attached so there is neither a tension force nor a spring force.) The force of gravity acts downward with a magnitude of m•g = (0.250 kg) •(9.8 m/s/s) = 2.45 N. The net force is 2.45 N; when divided by mass, the acceleration can be found.

 a = Fnet / m = (2.45 N, down) / (0.250 kg) = 9.8 m/s/s, down

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