An object is held at a distance of 18 cm from a convex mirror creating an image that is 1/6 the object size. What is the focal length of the mirror?
a. -3.6 cm
c. -6.0 cm
b. -18 cm
d. -9.0 cm
A
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The very earliest Greek cosmological theory, several centuries before Ptolemy, stated that
A) the planets revolve in loop-the-loops [circles within circles] around Earth. B) the entire universe is in reality just the inside of a giant cosmic frog. C) the planets go in simple circles around the sun. D) the planets go in simple circles around Earth. E) the planets revolve in loop-the-loops around the sun.
A low-power source of energy could put out a lot of work provided it
A) exerted its power over a very large distance. B) operated for a short time. C) operated for a long time. D) exerted a sufficiently strong force. E) Nonsense-- there is no way that a low-power source can put out a large amount of work.
The statement "Different samples of a pure compound always contain the same elements in the same proportion by mass" is known as the law of ______________
Fill in the blank(s) with correct word
The maximum possible speed in nature is
a. warp 10 b. the speed of light. c. infinite. d. unknown.