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
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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?
How do most craters on moons form?
A. by tectonic activity B. impact of asteroids C. running water D. by volcanic activity E. earthquakes
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.
What is the equivalent resistance between points a and b when R = 13 ??
a.
29 ?
b.
23 ?
c.
26 ?
d.
20 ?
e.
4.6 ?