In winter, light-colored clothes will keep you warmer than dark-colored clothes if
a. you are warmer than your surroundings.
b. you are at the same temperature as your surroundings.
c. you are cooler than your surroundings.
d. you are standing in sunlight.
a
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Which of the following best describes why we have seasons on Earth?
A) The tilt of Earth's axis causes different portions of the Earth to receive more or less direct sunlight at different times of year. B) Earth's elliptical orbit means we are closer to the Sun and therefore receive more intense sunlight at some times of year than at others. C) The tilt of Earth's axis causes the Northern Hemisphere to be closer to the Sun than the Southern Hemisphere in summer, and vice versa in winter. D) The varying speed of Earth in its orbit around the Sun gives us summer when we are moving fastest and winter when we are moving slowest.
In a closed universe, the angles of a triangle add up to
A) less than 180 degrees. B) 180 degrees. C) more than 180 degrees.
Isaac Newton was able to estimate a value for G, the universal gravitational constant, from the following data: the radius of the Earth is about 6 400 km, the average density of rocks is about 5.50 g/cm3, and g = 9.80 m/s2 near the surface of the Earth. What value did Newton obtain for G?
The vertical columns of the periodic table are
referred to as a) periods. b) groups. c) fullerenes. d) lines.