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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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