Pls explain to me how to find the volume of a drop of water

An object is 10. cm from the mirror, its height is 3.0 cm, and the focal length is 2.0 cm. what is the image height? (indicate the object orientation by including the + or - sign with the answer.) hi = cm +1.33 -1.33 +0.75 -0.75

Aregion of space in which a measurable gravitational force is indicated by the force exerted on a test mass is called

In a system, when potential energy decreases, then entropy also decreases. true false