IB Physics Average power or power?

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A tutorial sheet of questions on power is given below.

  1. Define instantaneous power.
  2. Define average power.
  3. Is average power always one-half the maximum power ?
  4. Which is the correct equation, π˜— = Fv or π˜— = Fv cosπœƒ ?
  5. The resultant force acting on an object is given by F = a v + b, where v is the speed of the object and a and b are constants. The "area" under the graph of F versus v between v = 0 and v = V is equal to (a) the power when v = V, (b) the average power from v = 0 to v = V, (c) the total power from v = 0 to v = V (d) none of the above
  6. The engine of a car of mass m has a constant power output P. A drag force kv acts on the car as it is driven along a horizontal road, where v is the speed of the car. If the car starts from rest the speed of the car (a) increases at a constant rate, (b) increases at an increasing rate, (c) increases at a decreasing rate, (d) remains zero due to drag force.
  7. In question 6 the speed of the car (a) approaches a maximum value, (b) reaches a maximum value, (c) continues to increase, (d) approaches a maximum value that is proportional to k.

IB HL Physics Multiple slit interference

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A tutorial sheet of questions on multiple slit interference is given below.

  1. Laser light of wavelength πœ† passes through a double slit of separation d and slit width b. Describe the intensity pattern that is observed on a screen at a distance D from the double slit.
  2. Sketch a graph showing the intensity on the screen versus distance along the screen.
  3. Three parallel narrow slits are now used. Describe the interference pattern on the screen if the wavelength, slit spacing, slit width and distance to the screen are unchanged.
  4. A triple slit interference pattern is compared to a double slit interence pattern pattern using the same wavelength of light, slit spacing, slit width and distance from the slits. In the double slit pattern (a) the maxima are closer together and dimmer, (b) the maxima are closer together and sharper, (c) the maxima are the same distance apart and dimmer, (d) the maxima are the same distance apart and sharper
  5. Distinguish between primary maxima and secondary maxima. How many secondary maxima form between the primary maxima when 4 slits are used?