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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Which has the greater density, a lake full of water or a cupful of lake water?
A) the cupful of lake water B) the lake C) both have the same density
A child is trying to throw a ball over a fence. She gives the ball an initial speed of 8.0 m/s at an angle of 40° above the horizontal. The ball leaves her hand 1.0 m above the ground and the fence is 2.0 m high
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
Deoxyribonucleic acid (DNA) is a messenger molecule
Indicate whether the statement is true or false
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?