A point-mass of 13 grams at the end of a massless 80 centimeter long string is rotated at a rate of 4 revolutions per second. Find the kinetic energy of the point mass.

Aresearch study is done to find the average age of all u. s. factory workers. the researchers asked every factory worker in ohio what their birth year is. this research is an example of a census survey convenience sample simple random sample