A spaceship of mass m circles a planet (mass = M) in an orbit of radius R. How much energy is required to transfer the spaceship to a circular orbit of radius 3R?
a. GmM/(2R)
b. GmM/(3R)
c. GmM/(4R)
d. GmM/(6R)
e. 3GmM/(4R)
b
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Three spaceships A, B, and C are in motion as shown in the figure. The commander on ship B observes ship C approaching with a relative velocity of 0.83c
The commander also observes ship A, advancing in the rear, with a relative velocity of 0.48c. As measured by commander on ship B, at what speed is ship A approaching ship C? A) 1.3c B) 0.94c C) 0.25c D) 0.58c E) 2.2c
Some double-pane airplane windows darken when the inner pane is rotated. The panes are
A) thin films. B) Polaroid filters. C) optical fibers.
The largest difference between Mars' northern and southern hemispheres is that
A) the northern is higher overall, despite some high volcanoes in the south. B) the northern has all the outflows and must have been much hotter. C) the southern has a polar cap, but none ever forms in the north. D) the southern is much darker, with large mare-like basaltic lava flows. E) the southern appears older, with more impact craters.
There are positive and negative magnetic charges, analogous to positive and negative electric charges
a. True b. False Indicate whether the statement is true or false