In the "space" [or in "outer space"] between Earth and the moon there is
A) air, but no force due to gravity.
B) both air and a force due to gravity.
C) no air and no force [or pull] due to gravity.
D) a big cloud made of chocolate fudge.
E) no air, but there is a force due to gravity.
E
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Fiber optics has to do with:
a. the color of fabrics. b. light having fiber characteristics as well as wave and particle characteristics. c. string theory. d. none of the above.
44 g of petrified wood was found in a petrified forest. A sample showed a 14C activity of 100 decays/minute. How long has the tree been dead (in years)? (The half-life of carbon-14 is 5730 years and freshly cut wood contains 6.5 × 10^10 atoms of 14C per gram.)
a. 12300 b. 15600 c. 8500 d. 4700 e. 2400
A 6.0 cm tall object is placed 20 cm in front of a convex mirror with focal -100 cm focal length. What is the size of the image formed?
A. 5.0 cm B. 7.2 cm C. 7.5 cm D. 30 cm E. 12 cm
Stars in the upper right part of the Hertzsprung-Russell diagram are always ____ when compared to stars near the middle of the diagram
a. cooler b. brighter as seen from Earth c. larger d. smaller e. more massive