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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 | An astronaut is on a 100m lifeline outside a spaceship, circling the ship with an angular speed of 0.100rad/s. How far inward can she be pulled before the centripetal acceleration reaches 5g = 49 m/s2? | 72.7 m | |
| 8 | An automobile accelerates from zero to 30 m/s in 6.0 s. The wheels have a diameter of 0.40 m. What is the average angular acceleration of each wheel? | 25 rad/s^2 | |
| 8 | An ice skater spins at 2.5 rev/s when his arms are extended. He draws his arms in and spins at 6.0 rev/s. By what factor does his moment of inertia change in the process? | 0.42 | |
| 8 | An initially installed flywheel can store 106 J of kinetic energy when rotating at 300 rad/s. It is replaced by another flywheel of the same size but made of a lighter and stronger material. If its mass is half that of the original and it is now capable of achieving a rotational speed of 600 rad/s, what maximum energy can be stored? | 20*10^5 J | |
| 8 | An object consists of a rod (of length 3.0 m and negligible moment of inertia) to which four small 2.0- kg masses are attached, one at each end and one at each point on the rod 1.0 m from each end. (The masses are one meter apart.) The moment of inertia of this object about an axis perpendicular to the rod and through one of the inner masses: | 12 kg*m^2. | |
| 8 | An object of mass m and moment of inertia I has rotational kinetic energy KR. Its angular momentum is: | (2 IKR)^1/2 | |
| 8 | An object of radius R and moment of inertia I rolls down an incline of height H after starting from rest. Its total kinetic energy at the bottom of the incline: | cannot be found from the given information alone. | |
| 8 | An object with mass m and moment of inertia I is spinning with an angular momentum L. Its kinetic energy is: | 0.5 L^/I. | |
| 8 | Consider the use of the terms "rotation" and "revolution". In physics: | the words have different meaning. | |
| 8 | If a net torque is applied to an object, that object will experience: | an angular acceleration. | |
| 8 | Masses are distributed in the x,y-plane as follows: 6.0 kg at (0.0, 0.0) m, 4.0 kg at (2.0, 0.0) m, and 5.0 kg at (2.0, 3.0) m. What is the x-coordinate of the center of gravity of this system of masses? | 1.2m | |
| 8 | Masses are distributed in the xy-plane as follows: 10 kg at (2.0, 6.0) m, 4.0 kg at (2.0, 0.0) m, and 6.0 kg at (0.0, 3.0) m. Where would a 20-kg mass need to be positioned so that the center of gravity of the resulting four mass system would be at the origin? | (-1.4, -3.9) m | |
| 8 | Tasha has mass 20 kg and wants to use a 4.0-m board of mass 10 kg as a seesaw. Her friends are busy, so Tasha seesaws by herself by putting the support at the system's center of gravity when she sits on one end of the board. How far is she from the support point? | 0.67 m | |
| 8 | The Earth moves about the Sun in an elliptical orbit. As the Earth moves closer to the Sun, which of the following best describes the Earth-Sun system's moment of inertia? | decreases | |
| 8 | The Earth's gravity exerts no torque on a satellite orbiting the Earth in an elliptical orbit. Compare the motion at the point nearest the Earth (perigee) to the motion at the point farthest from the Earth (apogee). At the point closest to the Earth: | None of the above |
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