The process by which raindrops are formed by the collision of droplets is called
a. the Bergeron process.
b. fusion.
c. fission.
d. coalescence.
d
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Waves on a String: A 15-m rope is pulled taut with a tension of 140 N. It takes 0.545 s for a wave to propagate along the rope. What is the mass of the rope?
A. 1.7 kg B. 2.1 kg C. 2.8 kg D. 5.1 kg E. 3.2 kg
When a ball falls downward, it may have a net force
A) equal to its weight. B) of zero. C) equal to its weight minus air drag. D) any of the above E) none of the above
Virtually all the carbon-rich dust in the plane of the galaxy originated in
A) low-mass stars. B) planetary nebulae. C) high-mass stars. D) brown dwarfs. E) white dwarfs.
Which of these statements correctly compares battery cells in series with the cells in parallel?
a. When battery cells are in series, the voltage stays the same but the cells last longer. b. When battery cells are in parallel, the voltage increases, but the cells last the same amount of time. c. When battery cells are in series, the voltage increases and the cells last longer. d. When battery cells are in parallel, the voltage stays the same and the cells last longer. e. When battery cells are in parallel the voltage is the same and they last just as long as when the cells are in series.