To burn a hole in a piece of paper using light from the Sun, which mirror would work the best?
A) Plane
B) Convex
C) Concave
D) All of the given answers would work equally as well.
E) None of the given answers would burn a hole.
C
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Suppose you discovered a meteorite that contains small amounts of potassium-40, which has a half-life of 1.3 billion years, and its decay product argon-40
You determine that 1/16 of the original potassium-40 remains; the other 15/16 has decayed into argon-40. How old is the meteorite? Based on your answer, where is this meteorite probably from?
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The ball just clears the fence while still traveling upwards and experiences no significant air resistance. How far is the child from the fence? A) 0.73 m B) 1.6 m C) 2.7 m D) 3.8 m E) 7.5 m