Which has more potential
energy; a person waiting for
the roller coaster to go down
the hill or a your binder on your
desk?

A. person in roller coaster
B. binder on desk

I need help ASAP 30 points

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.

You hang a book bag on a spring scale and place the bag on a platform scale so that the platform scale reads 23.7n and the spring scale reads 13.8n. what is the magnitude of the force that earth exerts on the bag?

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.