A stone weighing 0.7 kilograms rolls down the inclined plane from position B to position A. Position A is located at sea level.

The difference in the gravitational potential energy of the ball between positions A and B is about joules. (Use PE = m × g × h, where g = 9.8 N/kg. )

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.

A40.0 l tank of ammonia has a pressure of 12.7 kpa. calculate the. volume of the ammonia if it’s pressure is changed to 8.4 kpa while its temperature remains constant.

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic