PHYS 102 Chapter 4 Homework (ERAU)
The water in the plumbing in a house is at a gauge pressure of 210,000 Pa. What force does this cause on the top of the tank inside a water heater if the area
of the top is 0.5 m2? (Ignore atmospheric pressure.)
A viewing window on the side of a large tank at a public aquarium measures 51 in. by 61 in. The average gauge pressure from the water is 7 psi. What is the
total outward force on the window?
A small statue is recovered in an archaeological dig. Its weight is measured to be 34.3 lb and its volume 0.07ft3.
A certain part of an aircraft engine has a volume of 1.9 ft3.
The depth of the Pacific Ocean in the Mariana Trench is 36,198 ft. What is the gauge pressure at this depth?
A storage tank 22 m high is filled with pure water. (Assume the tank is open and exposed to the atmosphere at the top.)
A modernday zeppelin holds 7,100 m3 of helium. Compute its maximum payload at sea level. (Assume the helium and air to be at 0°C and 1 atm.)
A juniperwood plank measuring 0.47 ft by 1 ft by 12 ft is totally submerged in water.
A rectangular block of ice with dimensions 2 m by 2 m by 0.3 m floats on water. A person weighing 845 N wants to stand on the ice. Would the ice sink below the surface of the water?
The wing of an airplane has an average crosssectional area of 14 m2 and experiences a lift force of 80,000N. What is the average difference in the air pressure (in N/m^2)between the top and bottom of the wing?
Describe the four phases of matter. Compare their external, observable properties.
Why is it that a person can lay still on a “bed” of nails (see the figure below) without suffering any serious injuries but would incur severe puncture wounds to
his feet if he tried to stand barefoot on the same “bed”?
Would the weight density of water be different on the Moon than it is on Earth?
The pressure in the air along the upper surface of an aircraft’s wing (in flight) is lower than the pressure along the lower surface. Compare the speed of the air
flowing over the wing to that of the air flowing under the wing.
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