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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 |
|---|---|---|---|
| 13 | For a wave traveling in a string, by what factor would the tension need to be increased to double the wave speed? | 4.0 | |
| 13 | I attach a 2.0-kg block to a spring that obeys Hooke's Law and supply 16 J of energy to stretch the spring. I release the block; it oscillates with period 0.30 s. The amplitude is: | 19 cm. | |
| 13 | If a radio wave has speed 3.00*10^8 m/s and frequency 94.7 MHz, what is its wavelength? | 3.17 m | |
| 13 | If a wave pulse is reflected from a free boundary, which of the following choices best describes what happens to the reflected pulse? 1) becomes inverted 2) remains upright 3) halved in amplitude 4) doubled in amplitude 5) both choices B and C are valid. | remains upright | |
| 13 | If it takes 4.0 N to stretch a spring 6.0 cm and if the spring is then cut in half, what force does it take to stretch one of the halves 3.0 cm? | 4.0 N | |
| 13 | If one could transport a simple pendulum of constant length from the Earth's surface to the Moon's, where the acceleration due to gravity is one-sixth (1/6) that on the Earth, by what factor would the pendulum frequency be changed? | about 0.41 | |
| 13 | If the frequency of a traveling wave train is increased by a factor of three in a medium where the speed is constant, which of the following is the result? 1) amplitude is one third as big 2) amplitude is tripled 3) wavelength is one third as big 4) wavelength is tripled 5) both choices A and C are valid. | wavelength is one third as big | |
| 13 | Suppose a 0.3-kg mass on a spring that has been compressed 0.10 m has elastic potential energy of 1 J. What is the spring constant? | 200 N/m | |
| 13 | Suppose a 0.3-kg mass on a spring that has been compressed 0.10 m has elastic potential energy of 1.0 J. How much further must the spring be compressed to triple the elastic potential energy? | 0.07 m | |
| 13 | Suppose a 0.30-kg mass on a spring-loaded gun that has been compressed 0.10 m has elastic potential energy of 1.0 J. How high above the spring's equilibrium point can the gun fire the mass if the gun is fired straight up? | 0.24 m | |
| 13 | Suppose there is an object for which F = +kx. What will happen if the object is moved away from equilibrium (x = 0) and released? 1) It will return to the equilibrium position. 2) It will move further away with constant velocity. 3) It will move further away with constant acceleration. 4) It will move further away with increasing acceleration. 5) None of the above. | It will move further away with increasing acceleration. | |
| 13 | The kinetic energy of the bob on a simple pendulum swinging in simple harmonic motion has its maximum value when the displacement from equilibrium is at what point in its swing? 1) zero displacement 2) 1/4 the amplitude 3) 1/2 the amplitude 4) 3/4 the amplitude 5) equal the amplitude | zero displacement | |
| 13 | The motion of a piston in an automobile engine is nearly simple harmonic. If the 1-kg piston travels back and forth over a total distance of 10.0 cm, what is its maximum speed when the engine is running at 3 000 rpm? | 15.7 m/s | |
| 13 | The oxygen molecule (O2) may be regarded as two masses connected by a spring. In vibrational motion, each oxygen atom alternately approaches, then moves away from the center of mass of the system. If each oxygen atom of mass m = 2.67*10^-26 kg has a vibrational energy of 1.6*10^-21 J and the effective spring constant is 50 N/m, then what is the amplitude of oscillation of each oxygen atom? | 8.0*10^-12 m | |
| 13 | The position of a 0.64-kg mass undergoing simple harmonic motion is given by x = (0.160 m) cos (πt/16). What is its period of oscillation? | 32 s |
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