Classical Mechanics
# 1D Kinematics

It takes about eight and a half minutes for light to reach the earth from the sun. How far away is the sun (in meters)?

**Details and assumptions:**

- The speed of light in vacuum is \(3 \times 10^8~\mbox{m/s}\).

If lightning did indeed strike the barn, how long (in seconds) does it take between Tim seeing the lightning strike and hearing the sound of thunder?

**Note:** Light travels at 300,000,000 m/s, and sound travels at 340 m/s.

Suppose the time it takes the sound to reach you is \(t_\textrm{radio}\) and the time is takes to reach your friend is \(t_\textrm{live}\). How much faster the sound reach you, compared to your friend (i.e. find \(t_\textrm{live}/t_\textrm{radio}\))?

**Details and Assumptions**:

- Take the speed of sound to be \(300 \text{ m/s}\).
- The speed of radio waves is \(300,000 \text{ km/s}\).

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