The average mass assigned to one atom of a
naturally occurring element is referred to as
a)the atomic mass.
b)the reaction mass.
c)the formula mass.
d)the chemical mass.
a
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The speed of Halley's comet, while traveling in its elliptical orbit around the sun,
A) decreases as it nears the sun. B) increases as it nears the sun. C) is zero at two points in the orbit. D) is zero at four points in the orbit. E) is constant.
In the late 18th century, two astronomers, both with the last name of _______________, were the first to attempt to map the shape of the galaxy
Fill in the blank(s) with correct word
Why do we call dark matter "dark"?
A) It emits no radiation that we have been able to detect. B) It is dark brown or dark red in color. C) It blocks out the light of stars in a galaxy. D) It contains large amounts of dark-colored dust.
A slide projector needs to focus the image of a 24.0-mm × 36.0-mm slide onto a square screen 1.50 m on each side. You want to fill the screen as completely as possible without any of the image falling beyond the screen
Due to space constraints in the projector, the slide must be placed 10.5 cm from the lens. (a) What magnification does the projector produce? (b) How far from the lens should the screen be placed? (c) What focal length projector lens is needed?