Physics Final Exam

REVIEW PROBLEMS

  1. Using the diagram above, what is the potential energy of the child and the sled if the combined mass of the two is 175 kg?
  2. Using the diagram above, what is the kinetic energy of the child and the sled at point B if the velocity of the boy and sled combo is 17 m/s? How does this relate to your answer from #1? Why?
  3. In the diagram above, where is the boy moving the fastest? Why? Slowest? Why?
  4. In a tug-of-war match, each side pulls with a force of 500 N, but the rope does not move. How much work is done?
  5. How much work is done lifting a 75 kg child 1.75 m?
  6. Marco pushes a stalled car 20 meters with a constant force of 500 N in 50 seconds. Calculate the average power Marco required to move the car.
  7. Use the following diagram to answer the questions.

  1. Use the following diagram to answer the questions.

  1. Draw the field lines for the following wire configurations.

a. Ib. c.

  1. The primary coil in a transformer has 76 loops and the secondary coil has 580 loops. The incoming primary voltage and current are 1250 V and 15.0 A.
  2. What type of transformer is this?
  3. What is the secondary power?
  4. What is the secondary voltage?
  5. What is the secondary current?
  6. Label the wavelength, amplitude, crest, trough, and identify many wavelengths are present in the given wave. Draw in the equilibrium line.

  1. What is the harmonic of the following wave? If this wave was found at 18 Hz, where would you find the 5th harmonic?
  1. A guitar string makes 80 vibrations in one second. What is the period? What is the frequency?
  2. A drum vibrates 180 times in 2 seconds. If the speed of sound is 340 m/s, what is the period, frequency and wavelength of the waves produced by the drum?
  3. If blue light has a frequency of 6.0 X 106 Hz, what is the period and wavelength of blue light?
  4. Sound with a frequency of 261.6 Hz travels through water at a speed of 1435 m/s. Find its wavelength in water.
  5. A hiker shouts toward a vertical cliff 685 m away. The echo is heard 4.00 s later.
  6. What is the speed of sound in the surrounding air?
  7. The wavelength of the sound is 0.750 m. What is its frequency?
  8. What is the period of the wave?
  9. An X-ray machine emits a wave with a frequency around 3.0x1016 Hz. What is the wavelength of this x-ray?
  10. A convex mirror has a focal length of -10.0 cm.What is the image position for an object that is placed 20.0 cm from the mirror?
  11. A 5.0-cm-tall object is placed 16 cm from a convex lens with a focal length of 8.4 cm. What are the image height and orientation?