The temperature increase in the stratosphere is

due to
a) Rayleigh scattering.
b) absorption of ultraviolet radiation.
c) the greenhouse effect.
d) photosynthesis.


b

Physics & Space Science

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Lens-Maker Formula: A double convex lens has faces with radii of magnitudes 18.0 cm and 20.0 cm. When an object is placed 24.0 cm in front of the lens, a real image is formed 32.0 cm from the lens.(a) What is the focal length of this lens?(b) What is the index of refraction of the material from which the lens is made?

Fill in the blank(s) with the appropriate word(s).

Physics & Space Science

According to Newton's second law, the force required to accelerate an object is equal to

a. its acceleration divided by its mass. b. its mass times the acceleration. c. its mass divided by the velocity. d. its weight times the velocity.

Physics & Space Science

A high tide is occurring at Charleston, South Carolina (151°W, 36°N). At approximately what other longitude is a high tide occurring?

a. 29°E b. 151°E c. 61°E d. 61°W e. 29°W

Physics & Space Science

In the equation: Number of Civilizations = Np × flife × fcivilization × fnow what do we mean by fnow?

A) the fraction of planets with civilizations on which the civilizations exist now B) the fraction of time since the Big Bang represented by the present era C) the fraction of all species ever to exist that we currently are aware of D) the fraction of planets in the galaxy on which a civilization could theoretically develop now E) the fraction of civilizations in the universe that currently are sending messages to us

Physics & Space Science