Sarah drives at a constant speed of 15 m/s around a circular horizontal curve of diameter 60 m. What are the magnitude and direction of her acceleration?
What will be an ideal response?
7.5 m/s2 toward the center of the circle
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The earth’s rotation (A) increases, (B) decreases, or (C) does not affect its gravitational binding energy.
A. increases B. decreases C. does not affect its gravitational binding energy
What is the CNO cycle?
A) a set of steps by which four hydrogen nuclei fuse into one helium nucleus B) the process by which helium is fused into carbon, nitrogen, and oxygen C) the process by which carbon is fused into nitrogen and oxygen D) the set of fusion reactions that have produced all the carbon, nitrogen, and oxygen in the universe
which of the following statements is true about very massive stars?
What will be an ideal response?
The light-gathering power of a telescope is directly proportional to the:
A) square of the diameter of the primary mirror or lens. B) cube of the diameter of the primary mirror or lens. C) square of the focal length of the primary mirror or lens. D) cube of the radius of curvature of the primary mirror or lens.