2
v7x10-3 m)
2. (25 marks) (a) use the ideal gas law to estimate the number of air molecules in
your physics lab room, assuming all the air is n2. the room size is 150m”, the
temperature is 20°c, the pressure is latm. (b) calculate the particle density in the lab
(that is, the number of molecules per cubic meter)

Imagine that you have two balloons (or, better yet, actually inflate two balloons, if possible). create static electricity around one of the balloons by rubbing it against your hair or your sweater and then bring that balloon close to the other balloon, which has not been charged. try this with at least one other object—and for variety in the discussion, avoid using an object already described by your classmates. then, for your initial post to the discussion, answer the following questions: what happened with the two balloons?