Chen is testing the friction of three surfaces. He pushes the same ball across three different surfaces with the same force and measures the distance of each ball. The ball moved ten inches across Surface 1, six inches across Surface 2, and fifteen inches across Surface 3.

Which could most likely describe the three surfaces?

A. Surface 1 is ice, Surface 2 is gravel, and Surface 3 is blacktop.
B. Surface 1 is gravel, Surface 2 is ice, and Surface 3 is blacktop.
C. Surface 1 is blacktop, Surface 2 is gravel, and Surface 3 is ice.
D. Surface 1 is blacktop, Surface 2 is ice, and Surface 3 is gravel.

Which of these has some mechanical energy? a. an atom b. heat inside earth c. a book on a shelf d. the fire from a lit match

Assume that two of the electrons at the negative terminal have attached themselves to a nearby neutral atom. there is now a negative ion with a charge -2e at this terminal. what are the electric potential and electric potential energy of the negative ion relative to the electron? the electric potential and the electric potential energy are both twice as much. the electric potential is twice as much and the electric potential energy is the same. the electric potential is the same and the electric potential energy is twice as much. the electric potential and the electric potential energy are both the same. the electric potential is the same and the electric potential energy is increased by the mass ratio of the oxygen ion to the electron. the electric potential is twice as much and the electric potential energy is increased by the mass ratio of the oxygen ion to the electron.

Use the illustration to describe how the electromagnetic spectrum changes as its frequency moves from radio waves to higher energy gamma waves in terms of wavelength and amplitude.