How does the dyramic viscosity of: (a) liquids (B) gases vary with temperature?
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- The pressure exerted on the floor by a person’s shoe heel varies in direct proportion to his or her weight, andinversely proportional to the square of the diameter of the heel. Find the particular equation when a pressure of 29.1 psi results from a man weighing 175 pounds wears shoes with a 2.55 inch diameter heel. Using the particular equation you find, predict the pressure (to the nearest psi) under the ¼ inch spiked heel of a woman weighing 125 pounds.The difference between liquids and gases is: a) There is no difference – liquids and gases are fundamentally the same. b) Liquids are fluids, but gases are not. c) Gases are fluids, but liquids are not. d) Liquids can be compressed, gases generally cannot. e) Gases can be compressed, liquids generally cannot.Why can gases be compressed so much more readily than solids or liquids?
- Jason wants to use a Pilates ball as a desk chair. The Pilates ball has a diameter of 65cm, and is filled to a recommended air pressure of 0.9 PSI. What is the average force of the air inisde the Pilates ball pushing out? If the ball is filled with carbon dioxide (CO2) at 22 degrees C, how many molecules of CO2 are in the ball? (Area of a sphere = 4pir^2, Volume of a sphere = 4/3pir^3)•35 Three children, each of weight 356 N, make a log raft by lashing together logs of diameter 0.30 m and length 1.80 m. How many logs will be needed to keep them afloat in fresh water? Take the den- sity of the logs to be 800 kg/m?.5) Submarines need to be extremely strong to withstand the extremely high pressure of water pushing down on them. An experimental research submarine with a volume of 15,000 liters has an internal pressure of 1.2 atm. If the pressure of the ocean breaks the submarine forming a bubble with a pressure of 250 atm pushing on it, how big will that bubble be?
- Compare the pressure exerted by the tires of your car on the road with the air pressure in the tires. For this project, you need to know the weight of your car, which you can get from a manual or a dealer. You divide the weight by 4 to get the approximate weight held up by one tire. You can closely approximate the area of contact of a tire with the road by tracing the edges of the tire contact on a sheet of paper marked with 1-inch squares beneath the tire. After you calculate the pressure of the tire against the road, compare it with the air pressure in the tire. Are they nearly equal? If not, which is greater?Would the mass of air in the room be lower or higher if the tables, equipment etc. in the room were considered? Explain your reasoning.How a deadweight tester can measure extremely high pressures (up to 10,000 psi in some applications).