What is the mean free path of an n2 molecule in an ultra-high-vacuum chamber at a pressure of 10â10 mbar?
what is the mean collision time?
the chamber has a diameter of 0.5 m. on average, how many collisions will the molecule make with the chamber walls compared with collisions with other molecules?
if the pressure is suddenly raised to 10â6 mbar, how do these results change?
take t to be room temperature = 300k.

Which property of fossils allow scientists to determine the relative rock ages..

Simon is writing a story about an astronaut whose spacecraft has been boarded by space pirates. the astronaut has her lucky penny in her hand behind her back as the space pirates break into the control room. she has just locked the controls so that the ship is accelerating in the direction of the control room’s ceiling. simon wants the astronaut to use the penny to hit a button on the control panel to turn off the lights and escape. the button is located a short distance behind and below the astronaut’s hands. how should simon use the theory of relativity to describe what the astronaut must do in order to hit the button?

Aball of mass 0.3kg is released from rest at a height of 8m.how fast is it going when it hits the ground? accleration due to gravity is g=9.8m/s