1) Describe the 4 possible patterns to the expansion to the Universe: re-collapsing, critical, coasting, and accelerating.
2) Explain why our estimate of the current age of the Universe depends on which model is correct.

The astronauts on the space shuttle flights experienced an acceleration of 29 m/s2 (about 3 "g's") during lift-off. what upward force must the astronaut's seat apply to the astronaut in order to cause this acceleration? assume the astronaut's mass is 70 kg, and compute this force when the acceleration is near the earth's surface so their weight equals latex: mg m g .