The nights are cold on Mercury because it has a negligible atmosphere
a. True
b. False
Indicate whether the statement is true or false
True
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Five gas molecules are found to have speeds of 100, 200, 300, 400, and 500 m/s. The rms speed (in m/s) is
a. 390. b. 300. c. 360. d. 330. e. 320.
A river 100 m wide flows 1 m/s due south. A boat that travels 1 m/s relative to the water is pointed due east as it crosses from the west bank. Relative to its starting point, the boat travels
A) nowhere. B) 100 m. C) 141 m. D) 200 m. E) more than 200 m.
Which of the following best describes how the greenhouse effect works?
A) 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. B) Greenhouse gases absorb X rays and ultraviolet light from the Sun, and this absorbed radiation then heats the atmosphere and the surface. 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.
Consider the following statement, and explain whether or not it is sensible: Earth is always precisely 1 AU from the Sun
What will be an ideal response?