a) Compare the average kinetic energy K,TRT of air molecules to the difference in gravitational energies, AU = mgz, at the top and bottom of a room, of height z = 3 m. Again, you can assume air is made of nitrogen only. Why doesn't the air in the room fall to the floor? What could you do to make it fall? b) This time calculate it for a 50 µm dirt particle of mass 1.25×10-10 kg. Does it fall to the ground and if so, why?

a) Compare the average kinetic energy K,TRT of air molecules to the difference in gravitational energies, AU = mgz, at the top and bottom of a room, of height z = 3 m. Again, you can assume air is made of nitrogen only. Why doesn't the air in the room fall to the floor? What could you do to make it fall? b) This time calculate it for a 50 µm dirt particle of mass 1.25×10-10 kg. Does it fall to the ground and if so, why?

University Physics Volume 3

17th Edition

ISBN:9781938168185

Author:William Moebs, Jeff Sanny

Publisher:William Moebs, Jeff Sanny

Chapter5: Relativity

Section: Chapter Questions

Problem 19CQ: The mass of the fuel in a nuclear reactor decreases by an observable amount as it puts out energy....

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Concept explainers

Relativistic Energy and Momentum

According to classical physics, time flow is the same for every observer. But according to einstein's theory, time flow is different for different observers. The idea that time flow is not the same for all may sound strange because we may not experience this effect in everyday life. This effect is only observed when an object moves with some velocity comparable to the velocity of light. This velocity is termed relativistic velocity.

Question

a) Compare the average kinetic energy K;TRT of air molecules to the difference
in gravitational energies, AU = mgz, at the top and bottom of a room, of height
z = 3 m. Again, you can assume air is made of nitrogen only. Why doesn't the air
in the room fall to the floor? What could you do to make it fall? b) This time
calculate it for a 50 µm dirt particle of mass 1.25×10-10 kg. Does it fall to the
ground and if so, why?

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