Open clusters tend to be ____ than globular clusters
a. younger and contain fewer stars
b. younger and contain more stars
c. older and contain fewer stars
d. older and contain more stars
e. more luminous and cooler
a
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What role do molecules play in spectral classification?
What will be an ideal response?
The image formed by a concave mirror when the object is placed between the mirror and the focal point has the following characteristics:
A) virtual, upright, enlarged, image distance is larger than object distance B) virtual, upright, reduced, image distance is smaller than object distance C) real, inverted, enlarged, image distance is larger than object distance D) real, upright, enlarged, image distance is larger than object distance E) virtual, inverted, reduced, image distance is smaller than object distance
A 30-kg child sitting 5.0 m from the center of a merry-go-round has a constant speed of 5.0 m/s. While she remains seated in the same spot and travels in a circle, the work the seat performs on her in one complete rotation is
a. 0 J. b. 150 J. c. 1 500 J. d. 4 700 J. e. 46 000 J.
Scientific equations in a conceptual course are mainly
A) recipes for plugging in numerical data. B) guides to thinking about the relationships between concepts. C) for mathematical problem solving. D) unfortunately a confusing way of explaining ideas.