<p> Subterm 2 Concept Questions (CP)</p><p>You may bring an 8.5”x11” page of notes to the final. The notes must be completely unique, your own work and in your OWN HANDWRITING. Waves/Sound 1. A person on a pier observes a set of incoming waves with a distance of 1.6 m between crests. A wave laps against the pier every 4.0 s. (a) What is the frequency of the waves? (b) What is the speed of the waves? (0.25 Hz, 0.4 m/s)</p><p>2. A pipe open at both ends has a fundamental frequency of 300 Hz when the temperature is 100°C. What is the length of the pipe assuming the speed of sound is 387 m/s? (0.64 m)</p><p>3. Transverse waves with a speed of 50.0 m/s are produced on a stretched string. If the waves have a wavelength of 0.75 m, what is their frequency? (67 Hz)</p><p>4. What is resonance? Give some examples.</p><p>5. A sound wave traveling at 335 m/s is emitted by a foghorn of a tugboat. An echo is heard 3.55 second later. How far away is the reflecting object? (595 m)</p><p>6. A commuter train passes a passenger platform at a constant speed of 35 m/s. The train horn is sounded at a frequency of 378 Hz when the train is at rest. (a) what is the frequency observed by a person on the platform as the train approaches and (b) as the train recedes from him? (c) What wavelength does the observer find in each case? (assume the speed of sound is 345 m/s) (421 Hz, 343 Hz, 0.819 m, 1.01 m)</p><p>7. When holding a conversation, a person will talk with an intensity of 3.2x10-6 W/m2. (a) What is the decibel level of the person talking? (b) If there are now two people talking at the same time, what is the new decibel level? (65 dB; 68 dB)</p><p>8. Draw a longitudinal wave and label the compressions and rarefactions.</p><p>9. Give an example of a longitudinal wave.</p><p>10. Draw a transverse wave and label the wavelength and the amplitude.</p><p>11. Give an example of a transverse wave.</p><p>12. How is constructive interference created? What would you hear if you were standing in a location of constructive interference?</p><p>13. How is deconstructive interference created? What would you hear if you were standing in a location of deconstructive interference?</p><p>14. Draw a quiet, high pitched sound wave.</p><p>15. I am standing by the side of a busy road waiting for my ride. I notice as cars move towards me they make a ______pitched sound and when they move away from me they make a ______pitched sound. Explain why this happens. 16. A physics student blows across an empty glass soda bottle and it makes a low pitched sound. If the student then fills the bottle half full of water, it makes a higher pitched sound. Explain how this even makes sound in the first place, and then why there are two different sounds.</p><p>Electrostatics: 1. Draw the electric field around 2 charges separated by a small distance when one charge is a -2C and the other is +6 C.</p><p>2. The distance, center to center, of two protons in a nucleus is 3.00 x 10-15 m. What is the electrostatic force between those two protons? (25.6 N)</p><p>3. A Styrofoam ball covered with a conducting paint has a mass of 5.0x10-3 kg and has a charge on 4.0 mC. What electric field directed upward will produce an electric force on the ball that will balance its weight? (12.2 N/C)</p><p>4. A charge has a value of 30.0 mC. (a) What is the electric field 4.00 cm away from the charge? (b) is it pointing towards the positive charge or away from it? (1.69x1011 N/C; away from)</p><p>5. If the distance from a negative 3C charge is tripled, the electric field changes by what factor? (1/9)</p><p>6. An electron with a charge value of 1.6 x 10-19 C is moving in the presence of an electric field of 400 N/C. What force does the electron experience? (6.4x10-17N)</p><p>7. A proton, initially at rest, is accelerated through an electric potential difference of 650 V. What is the potential energy of the proton? What is the speed of the proton? (1.04x10-16J, 3.53x105 m/s)</p><p>17. Explain how to charge an object by conduction.</p><p>18. Explain how to charge an object by induction.</p><p>19. Rubbing a rubber balloon against one’s hair will then allow the balloon to stick to a wall. Why?</p><p>20. One object with a positive charge is used to charge a second object by induction. Then a third object, with a positive charge is brought near the second, charged-by-induction object. Is the third object attracted to or repelled from the second, charged-by-induction object?</p><p>21. What is the same in a series circuit? What is the same in a parallel circuit?</p><p>22. In what type of circuit does adding all the individual currents up equal the total current of the circuit? In what circuit does adding all the individual voltages up equal the total voltage?</p><p>23. If you wanted to pick a wire with the largest resistance possible, what characteristics would this wire have?</p><p>24. Why can birds sit on high voltage wires without getting electrocuted?</p><p>25. In Christmas light, if one bulb goes out, the whole strand goes out. Why is this?</p><p>26. If two light bulbs are hooked up in series, the higher watt bulb will appear dimmer. Why is this? 27. If a 100 W light bulb is the only thing plugged into an American socket, it will shine with ______W of power. If the light bulb is plugged into a European socket it will shine with more than 100 W of power. Why is this?</p><p>28. What is a fuse used for in a circuit?</p><p>29. What type of magnetic pole (north or south) is located at Earth’s geographic north pole?</p><p>30. Draw the magnetic field for: a solenoid, a wire with current going horizontally west, and a wire with current going into the page.</p><p>31. A proton is traveling to the right in a magnetic field also to the right. What direction is the force on the proton? What if it was an electron?</p><p>32. A proton is traveling horizontally north in a magnetic field directed into the page, what direction is the force on the proton? What if it was an electron?</p><p>33. I want to make an electromagnet using a nail and a wire. What should I do to make the best electromagnet possible?</p><p>34. What is a step up transformer?</p>