Atoms are held together by
A) the electrostatic force of attraction between the protons in the nucleus and the surrounding electrons
B) the combined electrostatic force of attraction between the protons and neutrons in the nucleus and the surrounding electrons
C) the force of gravitational attraction between the protons in the nucleus and the surrounding electrons
D) the electrostatic force of attraction between the neutrons in the nucleus and the surrounding electrons
A
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Induction: A plastic rod is charged up by rubbing a wool cloth, and brought to an initially neutral metallic sphere that is insulated from ground. It is allowed to touch the sphere for a few seconds, and then is separated from the sphere by a small distance. After the rod is separated, the rod
A. is repelled by the sphere. B. is attracted to the sphere. C. feels no force due to the sphere.
Explain how we estimate that there are about 50-100 billion galaxies in the observable universe
What will be an ideal response?
The sum of the kinetic energy and potential energy is called ______________ energy
Fill in the blank(s) with correct word
Four different main-sequence stars are colored blue, orange, red, and yellow. What is their rank from coolest to hottest?
A) red, yellow, orange, blue B) blue, yellow, orange, red C) red, orange, yellow, blue D) orange, blue, yellow, red