# W1 Assignment "Introduction, Measurement, Estimating"

**Question description**

# Introduction, Measurement, Estimating

- 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

- Multiply 1.783 x 10
^{2}* 4.4 x 10^{-3}, taking into account significant figures. - What is the surface area of a sphere of diameter 2.4 x10
^{2}cm? - What is larger 4000 L or 4 x 10
^{5}cm^{3}and you must show your reasoning. - 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.

- 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/s
^{2}. How long does it take to stop? - 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.
- 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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