Astronomy part 3

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Author:
dwrght16
ID:
301268
Filename:
Astronomy part 3
Updated:
2015-04-21 21:39:17
Tags:
Astronomy part
Folders:
astro
Description:
test 3
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  1. The atomic nuclei of the same element always have the same number of protons.
    True
  2. Suppose you view the solar system from high above Earth's North Pole. Which of the following statements about planetary orbits will be true?
    All the planets orbit counterclockwise around the Sun.
  3. The planet in our solar system with the highest average surface temperature is _________.
    Venus
  4. The terrestrial planets are made almost entirely of elements heavier than hydrogen and helium. According to modern science, where did these elements come from?
    They were produced by stars that lived and died before our solar system was born.
  5. Observations show that interstellar clouds can have almost any shape and, if they are rotating at all, their rotation is not perceptible. However, as shown in the animation, the nebular theory predicts that a cloud will rotate rapidly once it shrinks to a small size. What physical law explains why a cloud will rotate rapidly as it collapses?
    the law of conservation of angular momentum
  6. The nebular theory also predicts that the cloud should heat up as it collapses. What physical law explains why it heats up?
    the law of conservation of energy
  7. The nebular theory also predicts that the cloud will flatten into a disk as it shrinks in size. Which of the following best explains why the collapsing cloud should form a disk?
    Colliding cloud particles exchange angular momentum and, on average, end up with the rotation pattern for the cloud as a whole.
  8. As you've seen, the nebular theory predicts that a cloud that gives birth to planets should have the shape of a spinning disk. Which observable property of our solar system supports this prediction?
    As you've seen, the nebular theory predicts that a cloud that gives birth to planets should have the shape of a spinning disk. Which observable property of our solar system supports this prediction?
  9. Suppose you start with 1 kilogram of a radioactive substance that has a half-life of 10 years. Which of the following statements will be true after 20 years pass?
    You'll have 0.25 kilogram of the radioactive substance remaining.

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