What are annular eclipses?
What will be an ideal response?
Sometimes when the Moon crosses between Earth and the Sun, it is a little closer to Earth and thus too small to fully cover the Sun. In such a case, you would witness an annular eclipse. That is a solar eclipse in which an annulus (meaning "ring") of the Sun's disk is visible around the disk of the Moon. The eclipse never becomes total; it never quite gets dark, and you can't see the faint features of the solar atmosphere. Annular eclipses occur because the Moon follows a slightly elliptical orbit around Earth. If the Moon is in the farther part of its orbit during totality, its apparent diameter will be less than the apparent diameter of the Sun, and thus you see an annular eclipse. Furthermore, Earth's orbit is slightly elliptical, so the Earth- to-Sun distance varies slightly, and consequently so does the apparent diameter of the solar disk, contributing to the effect of the Moon's varying apparent size.
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What is true of Mars?
A) Its atmosphere is mostly water vapor. B) Definite microfossils have been found. C) Its magnetic field is stronger than Earth's. D) Iron oxide on the surface is responsible for its reddish color. E) A pool of water was discovered by the Mars Rover.
A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s2 . The ball is referred to at the two-second time. The ball is referred to at the two-second time. The velocity is __________
Fill in the blank(s) with correct word
No radionuclides decay by emitting
a. protons. b. alpha particles. c. electrons. d. gamma rays.
Is there a force on the moon, and how do you know?
A) No, because the moon moves at an unchanging speed. B) No, because the moon is not accelerated. C) Yes, because there must be a force to keep the moon moving. D) Yes, because the moon is accelerated. E) Yes, because there must be a force pulling outward on the moon, away from Earth, to keep the moon from falling down to Earth.