Halley's Comet last passed Earth in 1986. It will be due back in:
A) 2012.
B) 2048.
C) 2061.
D) 2086.
E) the twenty-third century.
C
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If the red shifts of quasars arise from the expansion of the universe yet they have brighter magnitudes than galaxies with the same red shifts, the quasar must be
a. very small. b. within the Local Group. c. a single star with an extremely large mass. d. be moving toward Earth with a large radial velocity. e. emit a very large amount of energy per second.
Kepler's Laws: The planet Jupiter is 7.78 × 1011 m from the sun. How long does it take for Jupiter to orbit once about the sun given that the distance from the earth to the sun is 1.50 × 1011 m?
A. 2.3 years B. 5.2 years C. 6.0 years D. 12 years E. 27 years
Energy and Momentum: A 1200-kg pick-up truck traveling south at 15 m/s suddenly collides with a 750-kg car that is traveling east. The two vehicles stick together and slide along the road after colliding. A highway patrol officer investigating the accident determines that the final position of the wreckage after the collision is 25 m, at an angle of 50° south of east, from the point of impact. She also determines that the coefficient of kinetic friction between the tires and the road at that location was 0.40. What was the speed of the car just before the collision?
A. 20 m/s B. 4.8 m/s C. 14 m/s D. 23 m/s E. 17 m/s
Atoms of which group of elements have seven electrons in the outer shell?
a. Noble gases b. Alkali metals c. Alkaline earth metals d. Halogens