How would you expect the results of your experiment to change if you used the same friction block on a different surface? How would you expect your results to change if you set the friction block on a different side (so that the area of contact between the
two surfaces was different)?
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The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.

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)

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?