An annular solar eclipse occurs
A. when the Moon in its orbit is closest to Earth, and, so not able to cover the complete disk of the Sun.
B. every year when the Sun is highest in the sky.
C. when the Moon in its orbit is farthest from Earth, and, so not able to cover the complete disk of the Sun.
D. None of these choices is correct.
Answer: C
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A force on a particle depends on position such that F(x) = (3.00 N/m2)x2 + (6.00 N/m)x for a particle constrained to move along the x-axis. What work is done by this force on a particle that moves from x = 0.00 m to x = 2.00 m?
A) 10.0 J B) 20.0 J C) -48.0 J D) 24.0 J E) 48.0 J
How many protons does Radon have?
a. 6 b. 101 c. 31 d. 103 e. 86
Most nearby stars move relative to the Sun at speeds below about 30 km/s. Suppose you observe a nearby star that is moving much faster than this (say, 300 km/s). Which of the following is a likely explanation for its high speed?
A) It is probably a halo star that is currently passing through the disk. B) It is a very young star, recently formed. C) It has been pushed to high speed by the shock wave from a nearby supernova. D) It is a high mass star.
Which of the following quantities expressed in derived units includes the unit of length?
a. Area b. Volume c. Speed d. Density e. All of these