Estimate the solid angle from area A1, subtended by area A2 as shown, as area A1 moves from position i to position ii to position iii. That is, determine ?12,i , ?12,ii , and ?12,iii .
Assume that the area A1 is small enough compared to area A2 that it can be treated as a point. When A1 is at position ii,
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Imagine that an alien spaceship crashed onto Earth. Which statement would most likely be true?
A) The aliens' home world is another planet in our own solar system. B) The crash would create a noticeable crater. C) All the evidence of the crash would be quickly whisked off by the U.S. military to Area 51 in Nevada. D) It would crash in the ocean.
A projectile is launched at an angle of 15° above the horizontal and lands downrange. With no air resistance, what other projection angle for the same speed would produce the same downrange distance?
A) 30° B) 45° C) 50° D) 75° E) 90°
Four electrons move from point A to point B in a uniform electric field as shown below. Rank the electrons in diagrams I through IV by the changes in potential energy from most positive to most negative when traveling from A to B
a.
I = II = III = IV.
b.
II = III > I > IV.
c.
III > I = IV > II.
d.
II > I = IV > III.
e.
I > II = III > IV.
The original cloud from which the sun and planets formed had a composition rich in hydrogen and helium
Indicate whether the statement is true or false