A given net force propels an object along a straight-line path. If the net force were doubled, its acceleration would
A) quadruple.
B) double.
C) stay the same.
D) be half.
E) none of the above
Answer: B
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If an atom emits a photon, that photon must have a wavelength ________.
A. that corresponds to the energy difference between two orbitals B. as long as the distance between two orbitals C. shorter than the absorbed photon that caused the emission D. that corresponds to the lowest energy level of that atom E. that corresponds to twice the energy difference between two orbitals
For a nova to occur, the system must have already been a
A) astrometric binary. B) detached binary. C) spectroscopic binary. D) mass-transfer binary. E) eclipsing binary.
When a body moves in circular motion at constant speed
a. the velocity and acceleration point in the same direction. b. the velocity and acceleration point in opposite directions. c. the velocity and acceleration point perpendicular to each other. d. the acceleration is zero. e. none of the above.
Capacitors in Combination: Two capacitors are connected as shown in the figure, with C1 = 4.0 µF and C2 = 7.0 µF. If a voltage source V = 90 V is applied across the combination, find the potential difference across C1.
A. 57 V B. 36 V C. 60 V D. 9.0 V