Free Fall: A ball is thrown straight upward from ground level with a speed of 18 m/s. How much time passes before the ball strikes the ground if we disregard air resistance?
A. 3.7 s
B. 1.8 s
C. 1.1 s
D. 0.6 s
Answer: A
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In the context of a big bang model, identify a true statement about the flatness problem
A) It is the peculiar circumstance that the early Universe's average density was much more than the critical density but it was still flat. B) It is the peculiar circumstance that the actual density of the Universe will always be equal to the critical density and will always remain flat. C) It is the peculiar circumstance that the early Universe must have contained exactly the right amount of matter to make space-time flat. D) It is the peculiar circumstance that the early Universe's average density was considerably less than the critical density but it was still flat.
In the sun, rising currents of hot gas below the photosphere cause granulation
Indicate whether the statement is true or false
Triton has a retrograde orbit around Neptune. This means that ____________
a. Triton orbits in the same direction as Neptune rotates on its axis. b. Triton orbits in the opposite direction to the way Neptune rotates on its axis. c. Triton does not orbit around Neptune. Instead, it stands still.
The relative movement of a strike-slip fault is
A) left to right. B) right to left. C) horizontal. D) vertical.