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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 |
|---|---|---|---|
| 12 | Which of the following choices best corresponds to what is required by the second law of thermodynamics for any process taking place in an isolated system? 1) entropy decreases 2) entropy remains constant 3) entropy increases 4) entropy equals work done on the system 5) both choices C and D are valid. | entropy increases | |
| 12 | Which of the following choices is an appropriate unit for measuring entropy changes? 1) J×K 2) N×K 3) J/s 4) J/K 5) N/K | J/K | |
| 12 | Which of the following increases the internal energy of a solid metal rod? 1) raising it to a greater height 2) throwing it through the air 3) having the rod conduct heat 4) having the rod absorb heat 5) both choices B and D are valid. | having the rod absorb heat | |
| 13 | A 0.20 kg object, attached to a spring with spring constant k = 10 N/m, is moving on a horizontal frictionless surface in simple harmonic motion of amplitude of 0.080 m. What is its speed at the instant when its displacement is 0.040 m? (Hint: Use conservation of energy.) | 49 cm/s | |
| 13 | A 0.20-kg block rests on a frictionless level surface and is attached to a horizontally aligned spring with a spring constant of 40 N/m. The block is initially displaced 4.0 cm from the equilibrium point and then released to set up a simple harmonic motion. A frictional force of 0.3 N exists between the block and surface. What is the speed of the block when it passes through the equilibrium point after being released from the 4.0-cm displacement point? | 0.45 m/s | |
| 13 | A 0.20-kg block rests on a frictionless level surface and is attached to a horizontally aligned spring with a spring constant of 40 N/m. The block is initially displaced 4.0 cm from the equilibrium point and then released to set up a simple harmonic motion. What is the speed of the block when it passes through the equilibrium point? | 0.57 m/s | |
| 13 | A 0.20-kg mass is oscillating on a spring over a horizontal frictionless surface. When it is at a displacement of 2.6 cm for equilibrium it has a kinetic energy of 1.4 J and a spring potential energy of 2.2 J. What is the maximum speed of the mass during its oscillation? | 6.0 m/s | |
| 13 | A 0.20-kg object is attached to a spring with spring constant k = 10 N/m and moves with simple harmonic motion over a horizontal frictionless surface. At the instant that it is displaced from equilibrium by -0.050 m, what is its acceleration? | 2.5 m/s^2 | |
| 13 | A 0.20-kg object is oscillating on a spring with a spring constant of k = 15 N/m. What is the potential energy of the system when the object displacement is 0.040 m, exactly half the maximum amplitude? | 0.012 J | |
| 13 | A 2.0-m long piano string of mass 10 g is under a tension of 338 N. Find the speed with which a wave travels on this string. | 260 m/s | |
| 13 | A car with bad shocks bounces up and down with a period of 1.50 s after hitting a bump. The car has a mass of 1 500 kg and is supported by four springs of force constant k. What is k for each spring? | 6 580 N/m | |
| 13 | A large spring requires a force of 150 N to compress it only 0.010 m. What is the spring constant of the spring? | 15 000 N/m | |
| 13 | A long string is pulled so that the tension in it increases by a factor of three. If the change in length is negligible, by what factor does the wave speed change? | 1.7 | |
| 13 | A mass of 0.40 kg, attached to a spring with a spring constant of 80 N/m, is set into simple harmonic motion. What is the magnitude of the acceleration of the mass when at its maximum displacement of 0.10 m from the equilibrium position? | 20 m/s^2 | |
| 13 | A mass of 0.40 kg, hanging from a spring with a spring constant of 80 N/m, is set into an up-and-down simple harmonic motion. What is the speed of the mass when moving through a point at 0.05 m displacement? The starting displacement of the mass is 0.10 m from its equilibrium position. | 1.2 m/s |
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