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UNC-Chapel Hill PHYS 115 - Density

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Phys 115-002 Lecture 2 Outline of Last Lecture I. Review of course structureII. Overview of physics topics to be covered, with their biological applicationsIII. Review of Newtonian mechanics: forcesIV. Review of energy (mostly mechanical)Outline of Current Lecture V. DensityVI. PressureCurrent Lecture- Liquids are incompressible – they can get as close as possible without touching each other. - Mass density – ratio of mass to volume- Pressure is the ratio of force over area. o When the same force is applied over a smaller area, there is more pressure.- There is pressure everywhere in a fluid, coming from all directions. - The pressure at depth d in a liquid is given byoo Hydrostatic pressureo Pressure is dependent on the density of the liquid.- Atmospheric pressure = 101.3 kPao At sea level- Rate pressures at point 1, 2, and 3.-o Rate pressures at point 1, 2, and 3. P2 = P3 > P1 Pressure across a horizontal line is equal in one fluid. Pressure increases with depth.o If elastic covered space above 3, it would bulge from pressure underneath.o If open above 3, then water would come out.These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- Pascal’s Principleo Change the pressure at one point; all points experience a pressure change.- Gauge Pressureo Is __ in excess of atmospheric pressureo 10 psi of gauge pressure is actually 25 psi in a basketball.- A U-tube is partly filled with water. Oil is then poured on top of the water on the left side of the tube. The final water levels on both sides are shown. The surface of the oil isnot shown. The density of the oil is less than that of the water.oo Pressure of A = Pressure of B; if they were different, the liquid would move.o Top of oil and top of water are equal in pressure; any surface open to air is at atmospheric pressure, regardless of height.- Will the top level of oil be above/below/same as top level of water? o Above because the density of oil is smaller, so more


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