Which of these statements is correct?
a. Like charges repel each other; unlike charges attract each other.
b. Like charges attract each other; unlike charges repel each other.
c. All charges attract each other.
d. All charges repel each other.
e. Two electrons, or two protons, will repel each other because they have like masses.
a
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How does the unified model of AGN explain blazars?
a. Blazars are Seyferts galaxies seen edge on. b. Blazars are regions of the intergalactic medium where gas has been heated by a nearby AGN. c. Blazars are relativistic jets from an AGN pointed toward our light of sight. d. Blazars are newly formed AGN from a recently galactic collision.
A solid uniform cylinder is rolling without slipping. What fraction of its kinetic energy is rotational?
A) 1/4 B) 2/3 C) 1/3 D) 1/2 E) 3/4
The terrestrial planets are made almost entirely of elements heavier than hydrogen and helium. According to modern science, where did these elements come from?
A) They were produced by gravity in the solar nebula as it collapsed. B) They were produced by stars that lived and died before our solar system was born. C) They have been present in the universe since its birth. D) They were made by chemical reactions in interstellar gas.
If the insulating material in a wall is modified so that the R-value is increased by 50%, how will the rate of energy transferred by conduction through the wall be affected?
1.It will increase by 50%. 2.It will decrease by 50%. 3.It will increase by more than 50%. 4.It will decrease by more than 50%.