Consider a concrete sphere of mass 17 kg. Find its radius. m Consider an airplan

Question

Consider a concrete sphere of mass 17 kg. Find its radius. m

Consider an airplane window (area 0.34 m2). If the pressure inside the plane is atmospheric pressure and the pressure outside is 18% of Patm, what is the force on the window? Ignore the velocity of the airplane (i.e., ignore Bernoulli's effect).
N
A car of mass 1540 kg rests on a hydraulic lift with a piston of radius 0.27 m that is connected to a second piston of radius 0.031 m. If the car is just barely lifted off the ground, what is the force at the second piston?
N

Explanation / Answer

1)pressure inside the planeP0=1 atm

pressure out side the plane Pa=0.18atm=0.18*1.013*105 pa

pressure difference P=Pa -P0 =0.82*1.013*105 pa

force=P/*A=0.82*1.013*105 *0.34=28242N

2)

according to pascal 's law pressure isconstant

F1/F2=r1/r2

F2=F1r2/21=1540*9.8*0.031/0.27=1732N

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