For Newton's third law, the action and reaction forces are equal in ______________ and opposite in direction
Fill in the blank(s) with correct word
magnitude
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Which of the following planets' average density is closest to that of Earth?
A) Mercury B) Mars C) Venus D) Neptune
What is the Kuiper belt?
A. a halo of light seen around some bright comets B. a region beyond Neptune in which a large number of small icy objects orbit C. streaks seen in the tails of some comets D. a prize given to the person who discovers the most asteroids in a given year E. a ring around Jupiter in which comets are captured
Which of the following best describes how the greenhouse effect works?
A) Greenhouse gases absorb X-rays and ultraviolet light from the Sun, and this absorbed radiation then heats the atmosphere and the surface. B) A planet's surface absorbs visible sunlight and returns this absorbed energy to space as infrared light. Greenhouse gases slow the escape of this infrared radiation, which thereby heats the lower atmosphere. C) Greenhouse gases absorb infrared light coming from the Sun, and this absorbed sunlight heats the lower atmosphere and the surface. D) The greenhouse effect is caused primarily by ozone, which absorbs ultraviolet light and thereby makes the atmosphere much hotter than it would be otherwise.
A body oscillates with simple harmonic motion along the x axis. Its displacement varies with time according to the equation x = 5.0 sin (pt + p/3). The velocity (in m/s) of the body at t = 1.0 s is
a. +7.9 b. -7.9 c. -14 d. +14 e. -5.0