According to current theory, the proton is made of smaller particles known as
A) electrons. B) neutrons. C) mesons. D) quarks. E) neutrinos.
D
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Briefly explain why there is a main sequence on the H-R Diagram
What will be an ideal response?
What do the three black arrows represent?
A) the tidal force Earth exerts on the Moon B) the Moon's gravitational force at different points on Earth C) the direction in which Earth's water is flowing D) Earth's orbital motion
An annular eclipse
A. occurs when the Moon's shadow does not completely reach Earth during a solar eclipse. B. occurs when Earth's shadow does not completely reach the Moon during a lunar eclipse. C. is a lunar eclipse that happens every November. D. is a solar eclipse that happens every November.
The image formed by a concave mirror when the object is placed between the mirror and the focal point has the following characteristics:
A) virtual, upright, enlarged, image distance is larger than object distance B) virtual, upright, reduced, image distance is smaller than object distance C) real, inverted, enlarged, image distance is larger than object distance D) real, upright, enlarged, image distance is larger than object distance E) virtual, inverted, reduced, image distance is smaller than object distance