1.A horizontal force P = 100 N is just sufficient to hold the cratefrom sliding down the plane, and P = 350 N is required to just pushthe crate up the plane. What is the mass?
2.It is desired to obtain dynamic similarity between 3 cfs of water(ρ = 1.94 slug/ft3, μ= 2.735 x 105Ibs/ft2) flowing in a pipe and oil 9s.g = 0.91, μ=12 x 105 ibs/ft2) flowing in a 12in diameter pipe at a velocity of 25 ft/s at 90 deg F. What size of pipe isnecessary for the water?