You are lying on a beach, your eyes 20cm above the sand. just as the sun sets, fully disappearing over the horizon, you immediately jump up, your eyes now 150 cm above the sand, and you can again just see the top of the sun. if you count the number of seconds until the sun fully disappears again, you can estimate the earth’s radius. but for this problem, use the known radius of the earth to calculate the time t.

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

no simpler subs form complex ones. synthesise = make

volts times amps 6 x 0.5 3w

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

hope this ! : )