During the daylight, you hold a ruler in a distance of 60 cm away from your eyes, and you find the size of the Moon to be 0.55 cm (try it yourself!). At night, you use a telescope to observe rock formations and craters on the Moon to estimate the diameter of the Moon to be about 3500 km.

Explanation:

The question is "Find the distance to the Moon by using only the information from this experiment"

You can set a proportional relation:

The precision of the result of the experiment is limited by the precision of the measurements done. The least precision of your measurements is that of the distance of 60 cm, which has one significant figure. Thus, your answer should also have one significant figure.

Then, you must report 400,000Km. If the distance of 60 cm would have been reported with two significant figures, i.e. 60. cm, then the answer would be 380,000Km.

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."

real, smaller and upside-down.   so the answer should be b.