If you consider the total distance and total time for a trip, you are calculating a(an)
A. average speed
B. constant speed
C. instantaneous speed
D. non-uniform speed
Answer: A. average speed
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Sunspots are ________ poles in the photosphere
Fill in the blank(s) with correct word
Electrons in atoms
a. orbit the nucleus in well-defined circular orbits. b. radiate electromagnetic energy continuously. c. act as if spread out in a "cloud" around the nucleus. d. behave as predicted by quantum mechanics.
A block of mass m is projected across a horizontal surface with an initial speed v. It slides until it stops due to the friction force between the block and the surface. The same block is now projected across the horizontal surface with an initial speed v/2. When the block has come to rest, how does the distance from the projection point compare to that in the first case?
1.It is the same. 2.It is half as large. 3.It is one fourth as large. 4.It is none of these.
Compared to smaller clouds with small droplets, a big cloud with large droplets
A) absorbs more light. B) is darker. C) is more likely to produce rain. D) all the above E) none of the above