s very susceptible to wind damage during a thunderstorm or tornado. If a flat roof has an area of 700 m2 and winds of speed 61.0 m/s blow above it, (a) determine the pressure difference between the upper and lower surfaces of the roof. The density of air is 1.29 kg/m3 . (Written steps required)  (b) determine the magnitude of the

It is a fact that blood flows more rapidly in the aorta than in the capillaries.  The cross sectional area of the aorta must be ___________ the total cross sectional area of the capillaries.   less than     equal to     greater than Consider an incompressible liquid flowing in a pipe of constant diameter.   ΔP is the pressure difference between the 2 ends of the pipe.  Choose the correct statement regarding the volumetric flow.  It will decrease with increased ΔP, and increase with greater pipe radius.     It will increase with increased ΔP, and increase with greater length of the pipe.     it will decrease with greater length of the pipe, and increase with greater pipe radius.     it will decrease with increased viscosity of the liquid, and decrease with greater pipe radius.

Suppose you measure a standing person’s blood pressure by placing the cuff on his leg 0.525 m below the heart. For this problem, assume that there is no loss of pressure due to resistance in the circulatory system (a reasonable assumption, since major arteries are large). The density of blood is 1.05×103 kg/m3 a. Calculate the systolic pressure you would observe, in units of mm Hgmm Hg, if the pressure at the heart was 120 over 80 mm Hg. Note that the top (and greater) number is the systolic pressure. b. Calculate the diastolic pressure you would observe, in units of mm Hgmm Hg, if the pressure at the heart was 120 over 80 mm Hg. Note that the bottom (smaller) number is the diastolic pressure.

(a) Calculate the absolute pressure at the bottom of a fresh-water lake at a depth of 26.2 m. Assume the density of the water is 1.00 x 103 kg/m3 and the air above is at a pressure of 101.3 kPa. Pa (b) What force is exerted by the water on the window of an underwater vehicle at this depth if the window is circular and has a diameter of 31.0 cm? N

(a) A submersible vehicle is in a lake at a depth of 22.2 m. What is the absolute pressure (in Pa) at this depth? The density of the water in the lake is 1.00 ✕ 103 kg/m3, and the air above is at a pressure of 101.3 kPa. ____ Pa   (b) The submersible vehicle has a circular window with a diameter of 33.0 cm. What force (in N) is exerted by the water on the window of the vehicle at the depth from part (a)? (Enter the magnitude.) ____N

An automobile weighing 1.19 x 104 N has weight equally distributed over its wheels. The weight of the car causes each tire to be slightly flattened on the bottom so that there is a surface area in contact with the road. The gauge pressure of the air in the tire is 1.90 x 105 Pa (27.55 lb/in2). Find the area of contact, assuming that the only forces on the section of tire in contact with the road are the air pressure and the normal force exerted by the surface of the road. (The answer is not 0.06263 m2)

(a) A submersible vehicle is in a lake at a depth of 26.6 m. What is the absolute pressure (in Pa) at this depth? The density of the water in the lake is 1.00 ✕ 103 kg/m3, and the air above is at a pressure of 101.3 kPa. ____Pa   (b) The submersible vehicle has a circular window with a diameter of 40.0 cm. What force (in N) is exerted by the water on the window of the vehicle at the depth from part (a)? (Enter the magnitude.) ____ N

An electrical short cuts off all power to a submersible diving vehicle when it is a distance of 26 m below the surface of the ocean. The crew must push out a hatch of area 0.55 m2 and weight 350 N on the bottom to escape. a)If the pressure inside is 1.0 atm, what downward force must the crew exert on the hatch to open it? Express your answer in newtons.

(a) Calculate the absolute pressure at the bottom of a fresh-water lake at a depth of 24.4 m. Assume the density of the water is 1.00 ✕ 103 kg/m3 and the air above is at a pressure of 101.3 kPa. Pa(b) What force is exerted by the water on the window of an underwater vehicle at this depth if the window is circular and has a diameter of 42.0 cm? N