What is the main requirement for a habitable zone?
A: Lots of sunshine
B: A large enough moon
C: Food supplies
D: Seasons
E: Liquid water
Ans: E: Liquid water
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Water is flowing at 4.0 m/s in a circular pipe. If the diameter of the pipe decreases to 1/2 its former value, what is the velocity of the water downstream?
a. 1.0 m/s b. 2.0 m/s c. 8.0 m/s d. 16 m/s e. 4.0 m/s
While Debbie Diver holds her breath and swims deeper and deeper beneath the water's surface, her density
A) increases. B) decreases. C) remains the same.
____________ of hydrogen atom nuclei in the core replace the heat the Sun ____________ to keep it in equilibrium
a. Nuclear fusion reactions; loses into space b. Nuclear fusion reactions; gains from empty space c. Chemical reactions; loses into space d. Chemical reactions; gains from empty space e. Nuclear fission; loses into space
Which of the following is true of S waves?
A) They travel faster than P waves. B) They can penetrate liquid. C) They are not transverse. D) They cannot pass through Earth's core.