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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 |
|---|---|---|---|
| 8 | The Earth's gravity exerts no torque on a satellite orbiting the Earth in an elliptical orbit. Compare the motion of the satellite at the point nearest the Earth (perigee) to the motion at the point farthest from the Earth (apogee). At these two points: | the angular momenta are the same. | |
| 8 | The quantity "angular momentum" (in terms of the fundamental quantities of mass, length, and time) is equivalent to: | ML^2T^-1 | |
| 8 | The quantity "moment of inertia" (in terms of the fundamental quantities of mass, length, and time) is equivalent to: | ML^2 | |
| 8 | The total kinetic energy of a baseball thrown with a spinning motion is a function of: | both linear and rotational speeds. | |
| 8 | Two children seat themselves on a seesaw. The one on the left has a weight of 400 N while the one on the right weighs 300 N. The fulcrum is at the midpoint of the seesaw. If the child on the left is not at the end but is 1.50 m from the fulcrum and the seesaw is balanced, what is the torque provided by the weight of the child on the right? | -600 Nm | |
| 8 | Two hoops or rings (I = MR^2) are centered, lying on a turntable. The smaller ring has radius = 0.050 m; the larger has radius = 0.10 m. Both have a mass of 3.0 kg. What is the total moment of inertia as the turntable spins? Ignore the mass of the turntable. | 0.038 kg*m^2 | |
| 9 | A 15 000-N car on a hydraulic lift rests on a cylinder with a piston of radius 0.20 m. If a connecting cylinder with a piston of 0.040-m radius is driven by compressed air, what force must be applied to this smaller piston in order to lift the car? | 600 N | |
| 9 | A blimp is filled with 400 m^3 of helium. How big a payload can the balloon lift? (The density of air is 1.29 kg/m3; the density of helium is 0.18 kg/m3.) | 444 kg | |
| 9 | A block of wood has density 0.50 g/cm3 and mass 1500 g. It floats in a container of oil (the oil's density is 0.75 g/cm3). What volume of oil does the wood displace? | 2000 cm^3 | |
| 9 | A block of wood has specific gravity 0.80. When placed in water, what percent of the volume of the wood is above the surface? | 20% | |
| 9 | A Boeing-737 airliner has a mass of 20 000 kg. The total area of the wings is 100 m^2. What must be the pressure difference between the top and bottom of the wings to keep the airplane up? | 1960 Pa | |
| 9 | A centrifuge rotates at 100 rev/s (i.e., 628 rad/s). If the test tube places the suspension at 8.0 cm from the axis of rotation, by what factor are the terminal speeds of the settling particles increased as compared to sedimentation cause by gravity? | 3.2*10^2 | |
| 9 | A copper wire of length 2.0 m, cross sectional area 7.1*10^-6 m^2 and Young's modulus 11*10^10 N/m2 has a 200-kg load hung on it. What is its increase in length? (g = 9.8 m/s2) | 5.0mm | |
| 9 | A cube of wood of density 0.78 g/cm3 is 10 cm on a side. When placed in water, what height of the block will float above the surface? (water density = 1.00 g/cm3) | 2.2 cm | |
| 9 | A fluid has a density of 1 040 kg/m^3. If it rises to a height of 1.8 cm in a 1.0-mm diameter capillary tube, what is the surface tension of the liquid? Assume a contact angle of zero. | 0.046 N/m |
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