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Question

all STC* 7:52 PM * 52% Assignment'%204%20without%20 answer.pdf vle.iau.edu.sa The name ssignment 4 1-The four tires of an automobile are inflated to a gauge pressure of 200 kPa. Each tire has an area of 0.024 m* in contact with the ground. Determine the weight of the automobile 2- The small piston of a hydraulic lift has a cross-sectional area of 3 cm2, and its large piston has a cross-sectional area of 200 cm2. What force of magnitude F1 must be applied to the small piston for the lift to raise a load whose weight is Fo 15 kN? (In service stations, this force is usually exerted by compressed air.) 3-At a given instant, the blood pressure in the heart is 1.6*10*Pa. If an artery in the brain is 45 cm above the heart, what is the pressure in the artery? lgnore any pressure changes due to blood flow.

Explanation / Answer

1. W = deltaP (A)

= (200 x 10^3 Pa)(0.024 m^2)

= 4800 N

2. F1 / A1 = F2 / A2

F1 / (3 cm^2) = (15 x 10^3 N) / (200 cm^2)

F1 = 225 N

3. delta(P) = rho g h

(1.6 x 10^4) - P = (1060 x 9.8 x 0.45)

P = 1.13 x 10^4 Pa

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