1. At which position does a simple harmonic oscillator have the most elastic pot
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1. At which position does a simple harmonic oscillator have the most elastic potential energy? Answer at equilibrium at maximum displacement Its elastic potential energy is always constant. Its elastic potential energy is always zero. 2. Resonance occurs when Answer an object is forced to vibrate at its natural frequency. when two waves that are exactly are the same meet and create a new wave with the same freq and wavelength, but twice the amplitude of the original waves. When two waves meet and create a new wave with alternating constructive and destructive areas. a and b only. 3. A mechanical waves require a medium to travel through. Answer This is always true This is never true. This is sometimes true 4. Which of the following is true of transverse waves? Answer they are mechanical waves particles of the medium vibrate perpendicular to direction of wave propagation. a vibrating piano string is an example all of these 5. The beat frequency heard when two notes are sounded is 20 Hz. If one note has a frequency of 500 Hz, what could the other frequency be? Answer 480 Hz 1000 Hz 10,000 Hz 25 Hz 6. A train whistle emits a 500 Hz tone. If the train approaches you at 50 m/s and you are stationary, what will you hear? Answer a pitch higher than 500 Hz a pitch lower than 500Hz A 500 Hz pitch. 7. When a sound source approaches you ( assume you are stationary) the wavelength of the sound wave Answer is smaller is larger always remains the same. 8. The electrostatic force between two charged objects is Answer inversely related to the distance between them. inversely related to the square of the distance between them. directly related to each charge both b and c 9. The electric field strength at a pt near a charge Answer is directly related to the charge producing it. is inversely related to the sqaure of the distance from the charge producing it. is independent of any charge at the location where it is being measured. all of these 10. An electrolytic capacitor contains Answer two conductive strips of metal strips of paper paste all of these 11. f you cut the distance between two parallel plates in a capacitor by 1/2, the capacitance will Answer be cut in half double be cut by 1/4 quadruple 12. A train whistle emits a 500 Hz tone. If the train passes you at 50 m/s and you are stationary, what frequency will you hear. The speed of sound is 343 m/s. Answer 585 Hz 500 Hz 436 Hz none of these 13. A 20 kg mass vibrating on a string has the following position function: x (t) = 2.0 cm cos ( pi/2 t ) What is the angular frequency of the oscillator? Answer 2.0 rad/s pi/2 rad/s 0.25 rad/s 4.0 rad/s 14. A 20 kg mass vibrating on a string has the following position function: x (t) = 2.0 cm cos ( pi/2 t ) What is the frequency of the wave? Answer 2.0 Hz pi/2 Hz 0.25 Hz 4.0 Hz 15. A 20 kg mass vibrating on a string has the following position function: x (t) = 2.0 cm cos ( pi/2 t ) What is the spring constant of the spring in N/m. Round your answer to 2 sig digs and do NOT type the units. Answer 16. A proton is located 6.0 mm from another proton. Determine the magnitude of the electrostatic force exerted by one proton on the other. What would the force be if you tripled the distance between them? What would the force be if you cut the distance to 1/3 of the original distance? 17. A flute behaves like an open pipe. If the fingering used to plan a note on a flute creates an open pipe that is 0.40 m and the speed of sound inside the flute is 340 m/s, What will be the first three harmonic frequencies produces by the flute? Show all calculations and include units for full credit.Explanation / Answer
15) wt = pi/2 t
w = pi/2
sqrt k/m = pi/2
k = 3.14^2 *20/ 4 = 49.3
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