an airplane prop has a radius of 1.5 m. if it starts from rest and accelerates uniformly to an angular speed of 55 rad/s in a time of 3.0 s, what is the tangential acceleration of the tip of the prop?

If you visited mount shasta city (elevation 900 m [3000 ft.]) and found the outside air temperature to be 27°c (81°f), what would be the air temperature at the summit of mount shasta (elevation 4200 m [14,000 ft.]) at that moment-assuming that the temperature conditions with altitude change at an average, or normal, lapse rate?