1. Physics 111 Ideal Gas Law and Kinetic Theory

2. Review Problem  From her bedroom window, a girl releases a water balloon that falls to the ground, 6.0 meters below. If it is released from rest, how long is it in the air?

3. Answer:  Yf = Yi + vt+.5at^2  T= 1.1 seconds

4. Review Problem 2:  An airplane is moving horizontally with a constant velocity of +115 m/s at an altitude of 1050m. Determine the time required for a care package, released at t=0, to hit the ground

5. Solution:  T = 2y/a ^.5 = 14.6 seconds

6. Today’s material  At a pressure of 5.0 atmospheres, a sample of gas occupies 40. liters. What volume will the same sample occupy at 1.0 atmosphere?

7. Solution:  PV=PV = 50*4 = 1* v = 200 L

8. Today’s Material  A sealed container has a volume of 0.060 m3 and contains 8.0 g of molecular nitrogen (O2) which has a molecular mass of 32.0 u. The gas is at a temperature of 345 K. What is the absolute pressure of the nitrogen gas?

9. Solution:  P=nRT/V  N= 8/32=.25  P=.25 (8.31)(345) /.060 = 1.2 * 10^4 Pa

10. Problem 2:  In a nitrogen gas occupies has a volume of 500ml at a pressure of 0.971atm.What volume will the gas occupy at a pressure of 1.50 atm, assuming the temperature remains constant?

11. Solution:  V= 500 mL  P=.971  P2 = 1.50  V2 = ?? .971 *500 = 1.50 * v2  P/v = P/V =324 ml