Historical evidence suggests that the methods of modern science were originated by the
A) Mayans
B) Egyptians
C) Greeks
D) Babylonians
C
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We know that the numbers of stars _________ from _______ to ________ on the H-R diagram
a. increases, upper right, lower left b. decreases, upper left, lower right c. increases, upper left, lower right d. decreases, upper right, lower left
A sharp knife can more easily cut objects than can a dull knife because
A. sharp knives have edges that can fit between the molecules of the object. B. a greater force can be applied with a sharp knife. C. dull knives cannot apply large forces. D. a greater pressure can be applied with a sharp knife.
Coal beds are formed from the accumulation of plant material that becomes trapped in swamp floors. Yet coal deposits are present in the continent of Antarctica, where no swamps or vegetation exists. How can this be?
What will be an ideal response?
A woman 1.6 m in height wants a plane mirror so that she can view her full height. The minimum vertical size of such a mirror is
A. 0.8 m. B. 0.4 m. C. 3.2 m. D. 1.6 m. E. impossible to say without knowing the viewing distance.