Who is credited with first speculating that matter is composed of tiny unseen units?
A. Democritus
B. Aristarchus
C. Aristotle
D. Newton
E. Einstein
A. Democritus
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The data points in this diagram represent the measured speeds and distances of various galaxies, and the solid line represents a best fit to these data. The trend indicated by the solid line is known as
A) Hubble's law. B) Leavitt's law. C) the inverse square law for light. D) Kepler's third law.
The number of significant figures in 10001 is
A) two. B) three. C) five. D) six.
A 25-g traffic light hangs midway on a cable between two poles 40 meters apart. If the sag in the cable is 0.40 meters, what is the tension in each side of the cable?
a. 12,200 N c. 4900 N b. 9800 N d. 6100 N
Which of the following is not a unit of radiation dose?
a. rad c. rem b. RBE d. none of these choices