Which of the following means that a lens causes light rays to spread apart?
A. -f
B. +f
C.+di
D. -di

Write the equation for momentum, first using symbols for the variables, then using words for the variables.

An object is 10 cm from the mirror, its height is 1 cm and the focal length is 5 cm. what is the image height? (indicate the object orientation by including the + or - sign with the answer.) hi = cm +1 -1 +10 -10

Ababy stroller is a rest on top of a hill which is 10 m high. the stroller and baby have a mass of 20 kg. what is the potential energy of the baby and stroller?