Briefly explain how the Sun became hot enough for nuclear fusion.
Fill in the blank(s) with the appropriate word(s).
Answer: The Sun formed from a cloud of gas. As it contracted, its gravitational potential energy was converted to thermal energy. The Sun continued to contract until the core became hot enough to sustain nuclear fusion.
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The atom arrangement in liquid copper is ______________, with no long-range order.
Fill in the blank(s) with the appropriate word(s).
If you lived on the Moon how often would the Earth set below your horizon?
a. Every 24 hours b. Once a sidereal period (27.3 days) c. Once a synodic period (29.5 days) d. Every year e. Never
The least common type of star is a(n) ____
a. white dwarf b. lower main sequence c. upper main sequence d. giant e. supergiant
Which eats more for its size (volume)?
1) a man 2) a mouse 3) an elephant 4) each eats approximately an amount of food in proportion to its size. This is because 5) the smaller the animal is, the more radiating area it has proportional to its volume. 6) the larger the animal is, the more radiating area it has proportional to its volume. 7) neither of these has any bearing on the dietary behavior of living creatures.