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W1 Assignment “Physics”

Please solve the following problems. You must show all work for full/partial credit. When complete, attach a typed cover sheet and submit to the assignment drop-box.

#1. One lightyear is defined to be the distance light can travel in one year. (10 points)

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  • 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. (10 points)

#3. What is the surface area of a sphere of diameter 2.4 x102 cm? (10 points)

#4. What is larger 4000 L or 4 x 105 cm3 (and you must show your reasoning.) (10 points)

#5. A car travels 120 meters in one direction in 20 seconds. Then the car returns ¾ of the way back in 10 seconds. (10 points)

  • 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? (20 points)

#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. (10 points)

#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? (20 points)

Grading Guidelines 100 points total
Show Your Work 60%
Your Work is Mostly Correct 80%
Correct Work, but incorrect units 95%
Correct Work, and correct units 100%