Two vectors, of magnitudes 20 mm and 50 mm, are added together. Which one of the following is a possible value for the magnitude of the resultant?
A) 10 mm
B) 20 mm
C) 40 mm
D) 80 mm
C
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As material leaves an expanding star and begins to fall into a white dwarf close companion
a. an accretion disk will form around the white dwarf. b. the material will cool off because it begins to move at high velocities. c. the material will fall directly straight onto the surface of the white dwarf. d. the white dwarf will produce a protostar. e. the white dwarf's iron core will collapse.
In the hypothetical atomic interaction shown in figure C9.13, assume that initially the atoms have a total energy of 3 × 10-21 J at r = 0.1 nm. These atoms are
A. Unbound (they will separate to infinity).
B. Bound (they will not separate to infinity).
C. The answer depends on whether the atoms are initially moving toward or away from each other.
In a Nb nucleus, the number of protons, neutrons, and electrons is
A) 41, 52, 93. B) 41, 52, 52. C) 41, 52, 41. D) 41, 52, 0. E) 52, 41, 0.
A charge of 50-?C is placed on the y axis at y = 3.0 cm and a 77-?C charge is placed on the x axis at x = 4.0 cm. If both charges are held fixed, what is the magnitude of the initial acceleration of an electron released from rest at the origin?
a. 1.2 × 10^20 m/s2 b. 1.5 × 10^20 m/s2 c. 1.0 × 10^20 m/s2 d. 1.8 × 10^20 m/s2 e. 2.0 × 10^20 m/s2