2 A child on a bicycle starts at rest, and accelerates at a rate of 3m/s2 until she reaches 12m/s
a) How long does he take to reach that speed?
(2)
b) How far does he travel in that time?

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)