An object is placed 21 cm from a concave lens having a focal length of magnitude 25 cm. What is the magnification?

A) -0.54
B) 0.54
C) -0.32
D) -0.22
E) 0.22


B

Physics & Space Science

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The Oort Cloud is thought to be:

A) the cloud of gas and dust from which our solar system formed. B) a cloud of debris that occasionally encounters the Earth, causing a meteor shower. C) the spherical cloud of comets and some larger icy bodies surrounding the outer solar system. D) a cloud of asteroids moving between the orbits of Mars and Jupiter. E) the material in the ecliptic plane that creates the zodiacal light.

Physics & Space Science

What is the equivalent resistance between points a and b when R = 13 ??



a.
29 ?

b.
23 ?

c.
26 ?

d.
20 ?

e.
4.6 ?

Physics & Space Science

If a planet takes 140 years to orbit its host star, how far is it in units of A.U.?

What will be an ideal response?

Physics & Space Science

How do most craters on moons form?

A. by tectonic activity B. impact of asteroids C. running water D. by volcanic activity E. earthquakes

Physics & Space Science