What describes a basic principle of nature that always occurs under certain conditions.

In the image, the arrow is pointing to a celestial object. which attribute disqualifies the object from being a planet?

An observer that stands still as the electron moves by him, will observe

Aperson walking 1 mile everyday for exercise, leaving her front porch at 9: 00 am and returning to her front porch at 9: 25 am. what is the total displacement of her daily walk? a) 1 mileb) 0c) 25 minutes d) none of the above