) Based on observations, which of the following statements about stars in the Milky Way is generally true?
A) the older the star, the lower its abundance of heavy elements
B) the older the star, the bluer its color
C) the older the star, the faster its orbital speed
D) the younger the star, the higher its mass
E) the less massive the star, the older it is
A) the older the star, the lower its abundance of heavy elements
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A. linear/tutorial B. hierarchical C. webbed D. random
Which statements are true about a VIRTUAL image? (There may be more than one correct choice.)
A) Its location can be calculated, but it cannot be viewed directly by your eye without using auxiliary lenses. B) It cannot be photographed. C) It cannot be viewed on a screen. D) A plane mirror always forms a virtual image. E) A concave lens always forms a virtual image.
On a plot of F vs. x, what represents the work done by the force F?
A) the slope of the curve B) the length of the curve C) the area under the curve D) the product of the maximum force times the maximum x E) the maximum F times minimum x
The kilogram is currently defined as
A) the mass of a platinum-iridium cylinder kept in Sévres, France. B) the weight of a platinum-iridium cylinder as measured on the Earth's moon. C) the mass of 5.9786332 × 1026 protons. D) the mass of one liter of pure water, free of air, at standard temperature and pressure. E) the mass of a cube of pure water, free of air, 10 cm on each side, at standard temperature and pressure.