Radon is a naturally occurring radioactive gas found in soils, rocks, and water. An isotope
of Radon-222 has numerous dangerous effects while only a few benefits. Radon-222 is a noble
gas that is colorless, tasteless, and odorless. The half-life
AP Physics Midterm Questions
1. Does a car speedometer measure speed, velocity, or both?
A car speedometer measures only speed. It does not give any information about the direction, and so does not measure
5. If one object has a greater
Roche limit and how close the Moon would have to orbit Earth to be at the Roche limit
Edouard Roche, in 1848, was the first to describe the Roche limit. He described it as
being the smallest distance that a large satellite can approach without being torn
AP Physics Final Questions
11. Very high in the Earths atmosphere, the temperature can be 700C. Yet an animal there would freeze
to death rather than roast. Explain.
Even though the temperature is high in the upper atmosphere, the density of gas