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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 | How deep under the surface of a lake would the pressure be double that at the surface? (1 atm = 1.01*10^5 Pa) | 10.3 m | |
| 9 | How large a force is necessary to stretch a 2.0-mm-diameter steel wire (Y = 2.0*10^11 N/m^2) by 1.0%? | 6.3*10^3 N | |
| 9 | How much air must be pushed downward at 40.0 m/s to keep an 800-kg helicopter aloft? | 196 kg/s | |
| 9 | How much power is theoretically available from a mass flow of 1 000 kg/s of water that falls a vertical distance of 100 m? | 980 kW | |
| 9 | If the column of mercury in a barometer stands at 72.6 cm, what is the atmospheric pressure? (The density of mercury is 13.6*10^3 kg/m3 and g = 9.80 m/s2) | 0.968*10^5 N/m^2 | |
| 9 | In a large tank of liquid, the hydrostatic pressure at a given depth is a function of: | a) depth. b) surface area. c) liquid density. d) [ Choices a and c are both valid. ] e) Choices a and b are both valid. | |
| 9 | In an elastic solid there is a direct proportionality between strain and: | stress | |
| 9 | In order to overcome a surface tension of a fluid, a force of 1.32*10^-2 N is required to lift a wire ring of circumference 12.0 cm. What is the surface tension of the fluid? | 0.055 N/m | |
| 9 | It takes 2.0 minutes to fill a gas tank with 40 liters of gasoline. If the pump nozzle is 1.0 cm in radius, what is the average speed of the gasoline as it leaves the nozzle? (1 000 liters = one cubic meter) | 1.1m/s | |
| 9 | Legend says that Archimedes, in determining whether or not the king's crown was made of pure gold, measured its volume by the water displacement method. If the density of gold is 19.3 g/cm3, and the crown's mass is 600 g, what volume would be necessary to prove that it is pure gold? | 31.1 cm^3 | |
| 9 | Spherical particles of density 2.0 g/cm3 are shaken in a container of water (viscosity = 1.0*10^-3 N·s/m3). The water is 8.0 cm deep and is allowed to stand for 30 minutes. What is the greatest terminal velocity of the particles still in suspension at that time? | 4.4*10^-5 m/s | |
| 9 | Spherical particles of density 2.0 g/cm3 are shaken in a container of water (viscosity = 1.0*10^-3 N·s/m3). The water is 8.0 cm deep and is allowed to stand for 30 minutes. What is the radius of the largest particles still in suspension at that time? | 4.5*10^-6 m | |
| 9 | The bottom of a flat-bottomed aluminum boat has an area of 4.0 m2 and the boat's mass is 60 kg. When set afloat in water, how far below the water surface is the boat bottom? (water density = 1.0*10^3 kg/m3) | 0.015 m | |
| 9 | The bottom of a flat-bottomed aluminum boat has area = 4.0 m2 and mass = 60 kg. If two fishermen and their fishing gear with total mass of 300 kg are placed in the boat, how much lower will the boat ride in the water? (H2O density = 1.0*10^3 kg/m3) | 0.075 m | |
| 9 | The bulk modulus of a material, as a meaningful physical property, is applicable to which of the following? | solids, liquids and gases |
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