A roller coaster is going through a vertical loop (diameter 35 m) at a constant speed. How fast should the roller coaster be going so the passengers will feel no
more than 3.5 times their normal weight at the bottom of the loop? What force
will they feel from the seat at the top of the loop? What force would they feel halfway between the top and the bottom of the loop?

Transfer chemicals from one location to another to weather objects. a-water b-physical weathering c-chemical weathering

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)

If you let go of the notebook after lifting it, will it move? how?