A pulley system is such that a person pulls down with 10 N of force to lift a 20 N object. The machanical advantage is..
(MA = Fout/Fin)
O 0.5
O 2
O
30
Please help me

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)

Yvette hangs a 2.4kg bird feeder in the middle of a rope tied between two trees. the feeder creates a tension of 480 n in each side of the the rope.

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