Which isotope is least likely to be stable?
A) Ca-40
B) Cl-38
C) U-235
D) Xe-136

Explain using examples, what is simple harmonic motion and why it is an important area of study in physics.

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

Aplane flying horizontally at an altitude of 1 mile and a speed of of 500mih passes directly over a radar station. find the rate at which the distance from the plane to the station is increasing when it is 2mi away from the station.