Based purely on its size, which of these planetary bodies is least geologically active?
a. Mercury
b. Venus
c. Earth
d. Mars
e. Io
a
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What is a protostar?
A) a star that is still in the process of forming B) a star that has planets C) an intermediate-mass star D) a star in its final stage of life
The rings of Neptune:
A) were confirmed by the Voyager 2 in 1989. B) number five, with three narrow, two more diffuse. C) all lie within Neptune's Roche Limit. D) often appear as clumpy ring arcs, rather than complete and symmetrical. E) All of these are correct.
The principal axis is the
A) straight line drawn from the center of curvature to the mid point of the mirror. B) straight line drawn from the center of curvature to any point of the mirror. C) straight line drawn from the center of curvature to a point on the outer edge of the mirror. D) straight line joining any two points on the mirror. E) None of the other answers given is correct.
A 100-W resistance heater is connected to a 110-V dc source. What is the current through the heater?
A) 1.1 A B) 2.2 A C) 3.3 A D) 4.4 A E) 0.91 A