Briefly explain the meaning of each term in the equation
Number of Civilizations = NHP × flife × fcivilization × fnow.
What will be an ideal response?
NHP is the number of planets in the Milky Way that lie within the habitability zones of their stars. flife is the fraction of these planets with life. fcivilization is the fraction of these planets on which a civilization develops at some time. fnow is the fraction of these planets on which the civilization exists now.
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Notice the blue ovals (such as those indicated by the arrows) in this image of a galaxy cluster. The oval structures are not really located where they appear to be, but instead are multiple images of a single galaxy that lies directly behind the cluster. What do we call the process that creates these multiple images?
A) gravitational lensing B) cluster image distortion C) the arc effect D) dark energy
The weight of a 1200-kg car is supported equally by the four tires, which are inflated to the same gauge pressure. What gauge pressure is required so the area of contact of each tire with the road is 100 cm2?
A) 11.6 × 105 Pa B) 11.6 × 104 Pa C) 2.9 × 105 Pa D) 2.9 × 104 Pa
The amount of heat transferred to a system can be measured in _______.
Fill in the blank(s) with the appropriate word(s)
In a certain electroplating process gold is deposited by using a current of 14.0 A for 19 minutes. A gold ion, Au+, has a mass of approximately 3.3 × 10-22 g. How many grams of gold are deposited by this process?
A) 28 g B) 22 g C) 16 g D) 33 g E) 97 g