The medieval scientist Galileo thought up the firs porotype for the helicopter.
True Or False?

How to convert a friction to decimal ?

Comment on the effect of lubrication of the punch surfaces on the limiting drawing ratio in deep drawing.

Agas contained in a piston-oylinder assembly is initially at p1=100 ibf/ft^2? and occupies a volume of 3.75 ft. the gas is compressed to a pressure p2=500 ibf/ft^2 and a final volume of 0.5 ft. during the process, the relationship between pressure and volume is given as p= a +bv, where a and b are constants a)-determine the values and units for a and b b)-determine the volume, in ft, at an intermediate state where the pressure is 300 ibt/t2.