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Q1. Now take potential to be zero at y=0 in place of at infinity. What is the value of V_A at point A some positive distance y_1 from the sheet?

Q2. The average speed of a nitrogen molecule in air is about 6.70 102 m/s, and its mass is about 4.68 x10-26 kg.

(a) If it takes 3.60 x10-13 s for a nitrogen molecule to hit the wall and rebound with the same speed but moving in an opposite direction (assumed to be the negative direction), what is the average acceleration of the molecule for the period of this time interval?

(b) What average force does molecule exert on the wall?

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