An object 8.25 cm from a lens creates a virtual image at -26.8 cm from the lens. What is the focal length of the lens? just placing the question so others can use it on Acellus. answer is 11.92​

A500g object falls off a cliff and losers 100 j from its gravitational potential energy store. if the gravitational field strength g=9.8n/kg, how high is the cliff?

Immediately upon reaching its lowest point, a falling pendulum bob has its greatest amount of energy, which is the initial amount of potential energy. a. heat; less than b. heat; more than c. kinetic; less than d. kinetic; more than

What is an aquifer for science class