Velma bicycles northward at an unchanging speed of 4 m/s, and Mort jogs southward at an unchanging speed of 4 m/s. Mort's velocity relative to Velma is
A) 4 m/s southward.
B) 8 m/s northward.
C) 4 m/s northward.
D) zero.
E) 8 m/s southward.
E
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The diameter of the Sun is determined by measuring its ________ and ________.
A. mass; density B. distance; volume C. volume; density D. distance; angular size
In superstring theory the fundamental objects from which all forces and matter are built are:
a. Planck lengths. b. gravitons. c. gluons whose size of about 10^-25 m is the smallest distances in nature. d. loops of material that cannot be further subdivided, whose size of about 10^-35 m is the smallest distance in nature. e. quarks whose size of about 10^-25 m is the smallest distance in nature.
The atom arrangement in liquid copper is ______________, with no long-range order.
Fill in the blank(s) with the appropriate word(s).
The central peak of a crater is formed by ________.
A. ejected material falling back into the crater B. molten rock being thrown upward and then solidifying C. the upward rebounding of compressed rock D. regolith drifting toward the center of the crater E. None of these choices are correct.