Assume the earth's mass is 31.589 x 1025 kg, and radius is 60.9 x 103 miles, what would be the gravitational acceleration on such an planet in unit of m/s2? Use G=6.67x 10 -11 Nm2/kg2.

How does the image distance (di) of a convex lens compare with the image distance of a concave lens? a. the image distance of the convex lens is positive, and that of the concave lens is negative. b. both are negative for a virtual image. c. both are positive for a virtual image d. the image distance of the convex lens is negative, and that of the concave lens is positive.

Around faucet handle is part of a(n) a. lever b. screw c. inclined plane d. wheel and axle

The movement of electrons between atoms is called an