Choose all the answers that apply. the sun:

1.is the largest star in our solar system

2.is classified as a g2 star

3.is made mostly of hydrogen and helium

4.releases harmful uv and x-ray radiation

5.has an absolute magnitude greater than betelgeuse

Engines for propeller-driven aircraft are limited in their maximum rotational speed by the fact that the tip speed of the propeller must not approach the speed of sound in air (mach i). taking 6 ft as a typical diameter for a propeller of a light airplane and 1100 fils as the speed of sound, find the upper limit on the rpm (revolutions per minute) of the propeller shaft.