1.Determine the minimum volume of concrete needed to keep the gate(1m wide) in a closed position, with l=2m. Note the hinge at the bottom of the gate.
2.Saturated vapor R-410a at 0 degrees C in a rigid tank cooled to -20degrees C.
Find the specific heat transfer.
3.A 2kg piston accelerates to 20m/s from rest. what constant gas pressure is required if the area is 10cm^2, the travel is 10cm and the outside pressure is 100Kpa.
4.A piston moves a 25kg hammerhead vertically down 1m from rest to a velocity of 50m/s in a stamping machine.
what is the total change in energy of the hammerhead?