A concave objective lens and a convex eyepiece lens a convex objective lens and a concave eyepiece lens concave objective and eyepiece lenses convex objective and eyepiece lenses

This question is worth 54 points ! rock falls from a ledge to the ground what energy conversion occurs during this process a potential to kinetic b kinetic to potential c thermal to mechanical d chemical to mechanical

How many molecules are present in 3 mols of silicon dioxide (sio2)?

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?