A train traveling at 50. km/h approaches another train moving toward the first at 90. km/h. If they are 35. km apart (on a straight track) how long does it take before they meet?
A) 15. min
B) 55. min
C) 30. min
D) 45. min
E) 25. min
A
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A) 30° above the horizontal B) 45° above the horizontal C) 55° above the horizontal D) 60° above the horizontal E) 90° above the horizontal
A light bulb used in a slide projector draws a current of 6 amperes when operating on 120 volts.If two slide projectors are connected in parallel across the same 120-volt source, the current drawn from the source in amperes is
a. 3. b. 6. c. 9. d. 12. e. none of the above.
A 200-m radio telescope is used to investigate sources emitting a 21-cm wavelength. The minimum angular separation resolvable for this system is
A) 0.073°. B) 0.03°. C) 0.0013°. D) 0.154°. E) 0.0026°.
When it is summer in Australia, the season in the United States is
A. winter B. summer C. spring