Why is it believed that the rings of Saturn could not have formed just as the planet itself formed?
a. Over time the solar wind should have blown away the particles in the rings.
b. The particles in the rings should fall into the planet in a short period of time.
c. The rings are made of ice particles which would have been vaporized by the heat released as Saturn formed.
d. The outer planets do not have enough mass to hold on to the rings.
c
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A current element (length = 1.0 cm) lies along the x axis with its center at x = 0 and carries a 20-A current in the positive x direction. Consider only the field of this current element and decide which combination of the following statements is correct. 1 . The field at (0, 0, 1.0 m) is in the positive z direction. 2 . The field at (0, 1.0 m, 0) is in the negative y direction. 3 . The field at
(1.0 m, 0, 0) is zero. 4 . The field at (0, 0, 1.0 m) is in the negative y direction. a. 3 and 4 b. 1 and 3 c. 2 and 4 d. 1 and 2 e. None of these
Why couldn't you stand on the Sun's surface?
A) The Sun has no surface at all...the photosphere is an illusion. B) You could stand on the surface. C) The Sun doesn't have a solid surface. D) The Sun's surface is too highly magnetized for anything to survive there. E) You could stand on it, if a sufficiently protective spacesuit could be designed.
In the context of the Babcock model, briefly explain the reversal of the Sun's magnetic field from cycle to cycle
What will be an ideal response?
The place where light is brought into focus (to form an image) in the human eye is called the
A) retina. B) optic nerve. C) lens. D) pupil. E) cornea.