Problem 1: A football is kicked 51.4 meters. The ball is in the air 4.16 s before it lands. Use g = 9.81 m/s2 for your calculations a) Find the magnitude of the velocity.

b) Find the angle of its initial velocity in degrees above horizontal.

What happens to an isotope during radioactive decay?

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.

The pilot of a helicopter hovers at an altitude of 1200 feet over a park. the angle of depression to the base of a statue is 17 degrees. the angle of depression to the nearest park exit, in line with the statue, is 14 degrees. to the nearest foot, what is the distance from the statue to the exit?