1) Two crates of mass 20.0 kg and 35.0 kg are pushed up along an incline of 33.0 degrees by a force of 550 N. Coefficients of kinetic friction are 0.25 and 0.37 respectively for the two crates. (a) Draw force diagrams for each of the crates. (b) Calculate the acceleration of the two crates. (c) Calculate the contact force between the two crates. (d) What would be the contact force if the two crates are reversed?

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 you increase your walking speed from 7 m/s to 13 m/s in a period of 2 s. what is your acceleration?

Awater-filled u-tube manometer is used to measure the pressure inside a tank that contains air. the water level in the u-tube on the side that connects to the tank is 5 ft above the base of the tank. the water level in the other side of the u-tube (which is open to the atmosphere) is 2 ft above the base. determine the pressure within the tank.