The distance between earth and mars is 225 million km. when converted using the conversion factor 1 au = 1.5 × 108 km, the distance between the planets is . the astronomical unit (au) is a light-year.

The mass of a muon is 207 times the electron mass; the average lifetime of muons at rest is 2.21 μs. in a certain experiment, muons moving through a laboratory are measured to have an average lifetime of 7.04 μs. for the moving muons, what are (a) β (b) k, and (c) p? the rest energy of the electron is 0.511 mev.

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.

More solar radiation is absorbed by earth’s surface than by