The magnitude of the total negative charge on the electrons in 1 kg of helium (atomic number 2, atomic mass 4) is:
A) 48 C
B) 2.4 × 107 C
C) 4.8 × 107 C
D) 9.6 × 107 C
E) 1.9 × 108 C
C) 4.8 × 107 C
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Which one of the following numbers is equivalent to the number 0.0001776?
A) 1.776 × 10-4 B) 17.76 × 10-3 C) 1776 × 10-5 D) 177.6 × 10-7
The image of an object beneath the surface of a medium of refractive index n > 1 is seen in air by a person looking down on the surface. This image, formed by light rays leaving the flat refractive surface, is
a. real and closer to the viewer than the object. b. virtual and closer to the viewer than the object. c. real and farther from the viewer than the object. d. virtual and farther from the viewer than the object. e. virtual and the same distance from the viewer as the object.
What observational evidence do we have that quasars are the centers of very distant galaxies?
What will be an ideal response?
A force F is applied to a cylindrical roll of paper of radius R and mass M by pulling on the paper as shown. The acceleration of the center of mass of the roll of paper (when it rolls without slipping) is
?
?
A.
.B.
.C.
.D.
.E.
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