When was Pluto discovered?
A) about 30 years ago
B) about 80 years ago
C) about 200 years ago
D) about 2000 years ago
E) in ancient history
B
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"Spikes" seen in images of stars are caused by ________.
A. disruption from nearby light sources B. diffraction from the telescope support structures C. dispersion from the telescope's primary lens D. deflection from the inner surfaces of the telescope
What are the most likely sources of the methane gas detected in the Martian atmosphere by the Mars Express orbiter and the Curiosity rover?
A) biological activity only B) biological or geological activity C) comet impacts only D) geological activity only
James and John dive from an overhang into the lake below. James simply drops straight down from the edge. John takes a running start and jumps with an initial horizontal velocity of 25 m/s. Assuming no effects of air, when they reach the lake below
A) the splashdown speed of James is larger than that of John. B) the splashdown speed of John is larger than that of James. C) they will both have the same splashdown speed. D) the splashdown speed of James must be 9.8 m/s larger than that of John. E) the splashdown speed of John must be 25 m/s larger than that of James.
If the image formed by a concave mirror is closer to the mirror than the object is, then, compared to the object, the image will be
A. smaller and inverted. B. larger and erect. C. larger and real. D. larger and inverted.