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.

An object is moving east, and it’s velocity changes from 65m/s to 25m/s in 10 seconds. which describes the acceleration?

Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)

Aball has an initial velocity of 3 m/s. if there is no friction, what is the highest it could roll?