What are the two largest moons of Neptune and what makes them peculiar objects in our Solar System?
What will be an ideal response?
The two largest moons, Triton and Nereid, have been a puzzle for years because of their peculiar orbits. Triton has a nearly circular orbit, but it travels retrograde—clockwise as seen from the north. This makes Triton the only large satellite in the Solar System with a backward orbit; all other retrograde satellites are very small. The other Neptunian satellite visible from Earth, Nereid, moves in the prograde direction, but its orbit is highly elliptical and very large. Nereid takes 359.4 days to orbit Neptune once. Triton is so cold (35 K) that it can hold a thin atmosphere. Triton is very efficient at absorbing sunlight. Its thin atmosphere does not dim sunlight, and its crust is composed of ices that are partially transparent to light. As the light penetrates into the ice and is absorbed, it warms the ices. However, the crust is not very transparent to infrared radiation, so the heat is trapped in the ice. So the crust of Triton appears to be heated, in part, by an icy form of the greenhouse effect.
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Increasing the diameter of a reflecting telescope:
A) increases its light-gathering power. B) decreases its resolving power. C) decreases its magnifying power. D) increases its chromatic aberration.
When green light shines on a cyan shirt, the color ________ is seen.
Fill in the blank(s) with the appropriate word(s).
Equilibrium: A push of magnitude P acts on a box of weight W as shown in the figure. The push is directed at an angle ? below the horizontal, and the box remains a rest. The box rests on a horizontal surface that has some friction with the box. The friction force on the box due to the floor is equal to
A. P sin ?. B. P cos ?. C. 0. D. P cos ? + W. E. P + W.
A toroid is made of 2 000 turns of wire of radius 2.00 cm formed into a donut shape of inner radius 10.0 cm and outer radius 14.0 cm. When a 30.0-A current is present in the toroid, the magnetic field at a distance of 11.0 cm from the center of the toroid is
a. 0.0857 T. b. 0.109 T. c. 0.120 T. d. 0.600 T. e. 0.685 T.