W1 Assignment "Introduction, Measurement, Estimating"

timer Asked: Sep 20th, 2013
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Introduction, Measurement, Estimating

  1. One lightyear is defined to be the distance light can travel in one year. 
    • What is this distance in meters?
    • How long does it take for light to get to the Moon
  2. Multiply 1.783 x 102 * 4.4 x 10-3, taking into account significant figures.  
  3. What is the surface area of a sphere of diameter 2.4 x102 cm?  
  4. What is larger 4000 L or 4 x 105 cm3 and you must show your reasoning.
  5. A car travels 120 meters in one direction in 20 seconds. Then the car returns ¾ of the way back in 10 seconds.
    • Calculate the average speed of the car for the first part of the trip.
    • Find the average velocity of the car.
  6. A sports car moving at constant speed travels 150 m in 4.00 s. If it then brakes and comes to a stop while decelerating at a rate of 6.0 m/s2. How long does it take to stop?
  7. Explain a possible situation where you start with a positive velocity that decreases to a negative increasing velocity while there is a constant negative acceleration.
  8. A stone is dropped from the roof of a high building. A second stone is dropped 1.25 s later. How long does it take for the stones to be 25.0 meters apart? 

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School: UT Austin

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