When the reflection of an object is seen in a concave mirror the image will
a. always be real.
b. always be virtual.
c. may be either real or virtual.
d. will always be enlarged.
c
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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
A car goes around a circular curve on a horizontal road at constant speed. What is the direction of the friction force exerted on the car by the road?
A) tangent to the curve in the forward direction B) tangent to the curve opposite to the direction of the car's motion C) perpendicular to the curve outward D) perpendicular to the curve inward E) There is no friction on the car because its speed is constant.
Suppose the jovian planet atmospheres were composed 100 percent of hydrogen and helium rather than 98 percent of hydrogen and helium. How would the atmospheres be different in terms of color and weather?
What will be an ideal response?
The theory of dark energy tells us that
A) empty space is seething with a form of energy. B) there is a force that behaves like an anti-gravity. C) there is still much to learn about this universe. D) All of the above.