A force of 17 N is applied to the end of a 0.63-m long torque wrench at an angle 45° from a line joining the pivot point to the handle. What is the magnitude of the torque about the pivot point produced by this force?
A) 7.6 N ? m
B) 10.7 N ? m
C) 12.0 N ? m
D) 9.7 N ? m
A
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Why don't we see the constellation Orion all year?
a) As the Earth orbits the Sun, its nighttime side points to different constellationsat different points along its orbit. b) It is frequently eclipsed by the Moon. c) When we are close to Orion it appears bright, but when we are far away it gets toofaint to see. d) Half the year it is visible in North America, and the other half in SouthAmerica. e) It is not along the Ecliptic path and only the constellations of the Zodiac are visibleall year round.
The best way to use a telescope to look for life on other planets is to
a. search for absorption from nitrogen in their atmospheres. b. search for absorption from oxygen in their atmospheres. c. search for emission lines from water vapor in their atmospheres. d. search for carbon dioxide on their moons.
Which two quantities need to be measured in order to determine the density of an extrasolar planet?
A) mass and composition B) orbital period and mass C) radius and orbital period D) radius and composition E) mass and radius
The typical temperature of an interstellar cloud that could collapse to a protostar is about ________.
A. 1,500 K B. 10 K C. 300 K D. 1,000 K