Physics Chapter 15
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At a certain depth in the ocean, the absolute pressure is p. If you go to twice that depth (treating the water as incompressible)
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the absolute pressure will be less than 2p
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If you double the pressure on the surface of a can of water, the buoyant force on a stone placed in that water will
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not change
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Diagram: Fluid fills the container shown in the figure. At which of the indicated points is the pressure greatest?
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the pressure is the same at each of the labeled points
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A cup of water containing an ice cube at 0°C is filled to the brim. The tip of the ice cube sticks out of the surface. As the ice melts, you observe that
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the water level remains the same
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Salt water is more dense than fresh water. A ship floats in both fresh water and salt water. Compared to the fresh water, the volume of salt water displaced by the ship is
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less than the volume of fresh water
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A 50-cm3 block of wood is floating partially submerged in water, and a 50-cm3 block of iron is totally submerged in water. Which block has the greater buoyant force on it?
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the iron
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A rock is under water in a shallow lake. As the rock sinks deeper and deeper into water, the buoyant force on it
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remains constant
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A piece of wood is floating in a bathtub. A second piece of wood sits on top of the first piece, and does not touch the water. If the top piece is taken off and placed in the water, what happens to the water level in the tub?
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it does not change
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Water flows through a pipe having a varying width. More water flows per second through the wide section than through the narrow section because there is more room for it to flow.
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false
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As the speed of a moving fluid increases, the pressure in the fluid
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decreases
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When you blow some air above the upper face of a paper strip, the paper rises. This occurs because
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the air above the upper face of the paper moves faster, which makes the pressure lower than at the lower face
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You are driving a late model convertible car at the 65 mph speed limit with its soft flexible roof closed up and the windows closed. You observe that the roof
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bows outward
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Tensile stress is
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the applied force per cross-sectional area
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Tensile train is
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the ratio of the change in length to the original length
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Two compressible solids are formed into spheres of the same size. The bulk modulus of sphere two is twice as large as the bulk modulus of sphere one. You now increase the pressure on both spheres by the same amount. As a result of the increased pressure, how is the change in volume of sphere two (△V2) related to the change in volume of sphere one (ΔV1)?
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deltaV2=1/2deltaV1
