Aman is running at speed c (much less than the speed of light) to catch a bus already at a stop. at t = 0, when he is a distance b from the door of the bus, the bus starts moving with the positive acceleration a. use a coordinate system with x = 0 at the door of the stopped bus.

(a) draw a position vs. time graph for both the man and bus on the same graph. make sure to label what object each curve corresponds to and the initial position of each object in the graph.
(b) what is xman (t), the position of the man as a function of time.
(c) what is xbus (t), the position of the bus as a function of time.
(d) what condition is necessary for the man to catch the bus? assume he catches it at the time tcatch. hint: when are the bus and person at the same position at the same time? (e) find the minimum speed, cmin that the man needs to catch the bus. (f) assume that the man misses getting aboard when he first meets up with the bus. does he get a second chance if he continues to run at the constant speed c > cmin?

19. explain why a magnet from your refrigerator could not be used to lift something as heavy as a car. (chapter 7 – pages 202-203) 20. can a magnet ever have a single pole? explain your answer. (chapter 7 – page 208) 21. what happens to the wavelength of a wave if the frequency is increased? (chapter 9 – pages 280-281) 22. an ocean wave has a wavelength of 10 m and a frequency of 4.0 hz. what is the velocity of the wave? show the appropriate equation from your book and show your work with units. (chapter 9 – page 282) 23. as you sit outside, the sound of a siren becomes lower in pitch. is the emergency vehicle moving away from or towards you? explain how you know. (chapter 10 – page 315-316) 24. why are two astronauts in space unable to hear one another? (chapter 10 – page 307) 25. explain in at least 3 sentences how electromagnetic waves form. (chapter 11 – page 338-339) 26. using the chart on page 345 in your textbook, what are the three types of electromagnetic wave with wavelengths shorter than those of visible light. give an example of each. (chapter 11 – pages 345-351) 27. explain why a leaf usually appears to be green, but a rose typically appears red. (chapter 12 – page 373) 28. what is the difference in light that is refracted compared to light that is reflected? think in terms of speed of light as well as what happens to light waves when they interact with a medium. (chapter 12 – pages 369-370) 29. how are concave and convex lenses different? (chapter 13 – page 408-410) 30. what type of mirror is used in rearview mirrors in cars? why is it important that these mirrors have the warning, “objects in mirror are closer than they appear.”? (chapter 13 – page 405)

Acold front traveling southeast collided with a warm front traveling northwest the following map shows the weather on monday the day the two fronts collided which of these describes the weather forecast for mississippi on tuesday and wednesday

What happens during the fall in september