A student has a small piece of steel. Describe an experiment that he could do to find the density of a steel.
you may draw a diagram to help your answer.
(5 marks)

Write the equation for momentum, first using symbols for the variables, then using words for the variables.

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.

What happens to an isotope during radioactive decay?