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35 Cards in this Set
- Front
- Back
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Is air a fluid? |
Yes. |
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What two forms of matter take the form of its container? |
Liquids and Gases |
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Can a change of pressure outside effect the pressure inside? |
Yes |
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What does a barometer measure? |
Air pressure |
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Can you experience extremely different pressures and feel fine? |
No, less or more air pressure can have a huge effect on a person. |
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Does altitude effect how water can boil? |
Yes, water boils at lower temperatures in higher altitudes |
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What is the formula for liquid and gas pressures? |
Pressure (P) = Force (F) / Area (A) P = F/A |
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Does a smaller area mean a larger force? |
Yes, force and area work inversely with each other. |
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What are two examples of a large force on a small area? |
High heels and sharpening knives |
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What is the unit of pressure? |
N/m² = Pascal = Pa |
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What principle is the one that states that any change in the pressure of an enclosed fluid at least is transmitted uniformly to all points on the fluid? |
Pascal's Principle |
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How would you apply Pascal's law? |
A hydraulic jack lifting a car, compressing one side will push up against the other side. Since they are connected, they experience the same pressure. |
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What is the formula for different pressures in the same container? |
P1 = F1/A1 and P2 = F2/A2, but because it is the same pressure, F1/A1 = F2/A2 |
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Is it possible for a 100-lb woman to exert a greater pressure on the ground than a 250-lb man? Explain. |
Yes, is the area of the pressure applied is smaller than the man's, she will apply a greater pressure. |
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If we measure force in pounds and distance in feet, what are the units of pressure in this system? |
lb/ft² |
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A force of 40 N pushes down on the movable piston of a closed cylinder containing a gas. The Pistons area is 0.5². what pressure does this produced in the gas |
40N/0.5m² = 80 Pa or 80N/m² |
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A 120-lb woman puts all of her weight on one heel of her high heel shoes the heel has an area of 0.25 in. What is the pressure that her heel exerts on the ground in pounds per square inch? (psi) |
120lb/.25in² = 480 lb/in². |
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What does psi mean? |
Pounds per square inch. A common unit used in real life. |
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In a hydraulic system a force of 400 N is exerted on a piston with an area of 0.001m². the load-bearing piston in the system has an area of 0.2m².
a. What is the pressure in the hydraulic fluid? b. What is the magnitude of the force exerted in the load-bearing piston by the hydraulic fluid?
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a. 400,000 N -> 400 N / 0.001m² = F2 / 0.2m² = (400 N / 0.001m²) * 0.2m² = 80,000 N |
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In what form of matter are P (Pressure), V (Volume), and T (Temperature) independent? |
Gas |
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Out of pressure, volume, and temperature in a gas, which one will remain constant? |
Temperature |
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In what machine is volume constant? |
A pressure cooker |
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Are initial pressure (P1) multiplied by initial volume (V1) equal to V2 *P2 after a change in pressure? |
Yes, P1V1 = P2V2 |
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In Boyle's Law, does P1V1 = P2V2 = PV = constant? |
Yes. |
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What is pressure in terms of since we've been dealing with it? |
Atmospheric pressure (atm) |
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Which principle states that be the buoyant force acting on an object fully or potentially submerged in fluid is equal to the weight of the weight of the fluid displaced by the object? |
Archimedes' Principle |
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What is one example of Archimedes' Principle? |
Ocean liners. Their volume displaces water. |
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What is the formula for density? |
Density (ρ) = mass (M) / volume (V) |
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In the buoyant force formula, what kind of mass is that mass? |
mf = mass of displaced fluid |
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What are the buoyant force formulas? |
Fb = density of the fluid (ρf) * volume of the fluid (Vf) * gravity (g) And Mass of the displaced fluid (mf) * gravity (g) |
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Is it possible for a boat made of concrete to float? Explain. |
Yes, if a thin layer of concrete spread out over a large enough space, it can float -> mass + density |
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Is it possible that some objects might float in saltwater but sink in freshwater? Explain |
Yes because salt increases water's density. |
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With the temperature held constant, the piston of a cylinder containing a gas is pulled out so that the volume increases from 0.1m³ to 0.3m³. If the initial pressure of the gas was 80kPa, what is the final pressure? |
80 kPa * 0.1m³ = P2*0.3m³ P2 = ((80 kPa * 0.1m³) / 0.3m³) = 26.66kPa |
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What form of matter does Boyle's Law involve? |
Gas |
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When an object is fully submerged, does Vf (volume of the displaced fluid) = Vo (volume of the submerged object)? |
Yes, when an object is fully submerged, Vf = Vo |
