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The following physics responses are provided by a student and, as such, should be considered in that context. While every effort is made for accuracy, absolute correctness cannot be fully guaranteed.
| C | I | Question | Answer |
|---|---|---|---|
| 9 | Water is being sprayed from a nozzle at the end of a garden hose of diameter 2.0 cm. If the nozzle has an opening of diameter 0.50 cm, and if the water leaves the nozzle at a speed of 10 m/s, what is the speed of the water inside the hose? | 0.63m/s | |
| 9 | Water is sent from a fire hose at 30 m/s at an angle of 30° above the horizontal. What is the maximum height reached by the water? | 11m | |
| 9 | Water pressurized to 3*10^5 Pa is flowing at 5.0 m/s in a pipe which contracts to 1/3 of its former area. What are the pressure and speed of the water after the contraction? (Density of water = 1*10^3 kg/m3.) | 2*10^5 Pa, 15 m/s | |
| 9 | What is the total force on the bottom of a 2.0-m-diameter by 1.0-m-deep round wading pool due to the weight of the air and the weight of the water? (Note the pressure contribution from the atmosphere is 1.0*10^5 N/m2, the density of water is 1 000 kg/m3, and g = 9.8 m/s2.) | 3.4*10^5 N | |
| 9 | What is the total mass of the Earth's atmosphere? (The radius of the Earth is 6.4*10^6 m, and atmospheric pressure at the surface is 10^5 N/m2.) | 5*10^18 kg | |
| 9 | What volume of water is displaced by a submerged 2.0-kg cylinder made of solid aluminum? (aluminum density = 2.7*10^3 kg/m3 and water density = 1.0*10^3 kg/m3) | 7.4*l0^-4 m^3 | |
| 9 | When water freezes, it expands about nine percent. What would be the pressure increase inside your automobile engine block if the water in there froze? (The bulk modulus of ice is 2.0*10^9 Pa, and 1 atm = 1.0*10^5 Pa.) | 1800 atm | |
| 9 | Which of the following characterizes the net force on a particle falling through a fluid at its terminal speed? | It is zero. | |
| 9 | Which state of matter is associated with the very highest of temperatures? | plasma | |
| 10 | 88°F is how many degrees Celsius? | 31 | |
| 10 | 9.0 g of water in a 2.0-L pressure vessel is heated to 500°C. What is the pressure inside the container? (R = 0.082 L*atm/mol*K, one mole of water has a mass of 18 grams) | 16 atm | |
| 10 | A 2.00-L container holds half a mole of an ideal gas at a pressure of 12.5 atm. What is the gas temperature? (R = 0.082 1 L*atm/mol*K) | 609 K | |
| 10 | A brass cube, 10 cm on a side, is raised in temperature by 200°C. The coefficient of volume expansion of brass is 57*10^-6/C°. By what percentage does volume increase? | 1.1% | |
| 10 | A brass cube, 10 cm on a side, is raised in temperature by 200°C. The coefficient of volume expansion of brass is 57*10^-6/C°. By what percentage is any one of the 10-cm edges increased in length? | 0.38% | |
| 10 | A helium-filled weather balloon has a 0.90 m radius at liftoff where air pressure is 1.0 atm and the temperature is 298 K. When airborne, the temperature is 210 K, and its radius expands to 3.0 m. What is the pressure at the airborne location? | 0.019 atm |
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