Contrast the orbits of comets and asteroids
What will be an ideal response?
Comet orbits are high in eccentricity and come from all directions in space; most are far beyond the orbit of Neptune during most of their orbits. Asteroid orbits are much more circular, and most lie close to the ecliptic between the orbits of Mars and Jupiter.
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What is a galaxy's rotation curve? To which galaxies is it best applied, and what does it tell us about the distribution of dark matter?
What will be an ideal response?
Two long straight parallel wires separated by a distance of 20 cm carry currents of 30 A and 40 A in opposite directions. What is the magnitude of the resulting magnetic field at a point that is 15 cm from the wire carrying the 30-A current and 25 cm from the other wire?
a. 51 mT b. 33 mT c. 72 mT d. 64 mT e. 46 mT
A good ammeter has ________ resistance and a good voltmeter has ________ resistance. "Good" means that it affects the system being measured by very little.
A. low, low B. low, high C. high, high D. high, low E. medium, no
Colors are barely seen or not at all in nighttime because moonlight
A) has almost no colors in it. B) is too dim to activate the retina's cones. C) photons don't have enough energy to activate the retina's cones. D) is primarily yellow light. E) is only semi-transparent in Earth's atmosphere.