Most of the atoms in the universe are thought to be
A) hydrogen.
B) helium.
C) about equal amounts of hydrogen and helium.
D) iron.
E) elements unknown at present.
Answer: A
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The hottest (O and B type) stars are usually binary stars, while the coolest (M type) stars are usually single stars.
Answer the following statement true (T) or false (F)
A wheel starts from rest and rotates with a constant angular acceleration about a fixed axis. It completes the first revolution 6.0 s after it started. How long after it started will the wheel complete the second revolution?
A. 9.9 s B. 7.8 s C. 8.5 s D. 9.2 s E. 6.4 s
All events and all things exist in "the spacetime continuum" with coordinates
A) of distances in three dimensions. B) of time. C) both of these D) none of these
Water flows over a section of Niagara Falls at a rate of 6.00 × 10^5 kg/s and falls 50.0 m. What is the power dissipated by the waterfall?
a. 588 MW c. 147 MW b. 294 MW d. 60.0 MW