A key is placed in a hot oven and warmed to 100°C. As a result
a. the hole in the key becomes smaller.
b. the key is bent into an arc.
c. the key becomes longer.
d. all of the above.
c
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An object moving at 30 m/s has an acceleration of -2.0 m/s/hr. Its speed
A. decreases very quickly. B. decreases very slowly. C. increases very slowly. D. increases very quickly.
A Young's double-slit apparatus is set up. The source wavelength is 424 nm, and the double-slit spacing is 0.0560 mm. At what distance from the double slits should the screen be placed if the spacing between alternating bright fringes is to be 1.60 cm? (1 nm = 10?9 m)
a. 211 m b. 2.11 m c. 0.825 m d. 279 m e. 2.11 m
When atoms of two elements with a great difference in electronegativity bond together, the bonding is probably
a. ionic. b. polar covalent. c. covalent. d. metallic.
Which of the following were marine invertebrates that looked like plants and left fossil segments sometimes called "Indian money"?
a. Trilobites b. Gastropods c. Crinoids d. Brachiopods