Kuiper belt objects appear to be ancient planetesimals that formed in the outer Solar System but were never incorporated into a planet
a. True
b. False
Indicate whether the statement is true or false
True
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A gamma ray is another name for a(n) __________
Fill in the blank(s) with correct word
Since 9/11 public health has emerged as a front-line defense against bioterrorism and other threats to personal security and safety.
a. true b. false
The tail of a comet always points
A) away from the Sun and becomes longest and brightest at perihelion. B) toward Earth and never varies. C) away from the Sun and disappears at perihelion. D) toward the Sun and disappears at perihelion. E) in the direction of the comet's motion.
A parallel plate capacitor is connected to a battery and charged to voltage V. Leah says that the charge on the plates will decrease if the distance between the plates is increased while they are still connected to the battery. Gertie says that the charge will remain the same. Which one, if either, is correct, and why?
a. Gertie, because the maximum voltage is determined by the battery. b. Gertie, because the capacitance of the capacitor does not change. c. Leah, because the capacitance decreases when the plate separation is increased. d. Leah, because the capacitance increases when the plate separation is increased. e. Neither, because the charge increases when the plate separation is increased.