When white light is viewed through sodium vapor in a spectroscope the spectrum is continuous?

Astone dropped into a well is heard to strike the water after 8seconds. find the depth of the well if the velocity of sound is 350m/s

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

Aspring has a natural length of 8 m. if a 12-n force is required to keep it stretched to a length of 10 m, how much work w is required to stretch it from 8 m to 16 m? (round your answer to two decimal places.)