Doctors use the radioactive isotope chromium-51 to label red blood cells in the human body. chromium-51 gives off relatively alpha particles that can be stopped by

An insurance company wants to know if the average speed at which men drive cars is higher than that of women drivers. the company took a random sample of 27 cars driven by men on a highway and found the mean speed to be 72 miles per hour with a standard deviation of 2.2 miles per hour. another sample of 18 cars driven by women on the same highway gave a mean speed of 68 miles per hour with a standard deviation of 2.5 miles per hour. assume that the speeds at which all men and all women drive cars on this highway are both approximately normally distributed with unknown and unequal population standard deviations.

How would doubling the made of an object change the objects potential energy

Anybody wanna ? (picture included? )