Consider the situation below. Object A is a metal sphere with zero net charge, and objects B and C are particles with the same negative charge. Which choice shown to the right best indicates the direction of the electric field at point P? (If you are using the letters on the back cover to indicate your answer, you can indicate the double-letter choices by pointing to a letter with two fingers.)
A. A
B. B
C. C
D. D
E. Zero
F. AA
G. BB
H. CC
I. DD
F. AA
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Suppose that Mars were located at the same distance from the Sun as Earth, but was otherwise the same. Would it still be colder than Earth? Why or why not?
A) yes, because Mars has fewer clouds than Earth B) yes, because Mars has a much weaker greenhouse effect than Earth C) yes, because Mars has less gravity than the Earth D) no, because with the same distance from the Sun, the two planets would have the same temperature
In general, the friction forces between one object and another act
A) in the same direction. B) in opposite directions. C) at right angles to each other. D) none of the above
A concave mirror having a focal length of magnitude 5.0 cm forms an image 4.0 cm behind the mirror. Where is the object for this image?
A) 2.2 cm in front of the mirror B) 2.2 cm behind the mirror C) 9.0 cm in front of the mirror D) 1.0 cm behind the mirror E) 20 cm behind the mirror
The average kinetic energy of the atoms in a spoon determines its __________
Fill in the blank(s) with correct word