As with Saturn's F ring, shepherd moons play a major role in the structure of the thin narrow rings around Uranus
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TRUE
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Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 0.20 m. What is the strength of the magnetic field midway between the two wires? (?0 = 4? × 10-7 T ? m/
A) A) 1.0 × 10-5 T B) 2.0 × 10-5 T C) 3.0 × 10-5 T D) 4.0 × 10-5 T E) 5.0 × 10-5 T
Resolution: Given perfect lenses, what is the main reason that a telescope with a large-diameter objective lens can produce a sharper image than one with a small-diameter lens?
A. A larger lens can gather more light than a smaller lens. B. A larger lens can focus more accurately than a smaller lens. C. There is less diffraction with a larger lens than with a smaller lens. D. A larger lens can focus more wavelengths of light than a smaller lens. E. A larger lens has a longer focal length than a smaller lens.
Measuring the amount of deuterium in the universe allows us to set a limit on ________
A) the acceleration of the universe B) the total amount of mass in the universe C) the density of ordinary (baryonic) matter in the universe D) the current age of the universe
Flow channels on Venus suggest it was once rich in water
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