A spaceship is traveling to the Moon. At what point is it beyond the pull of Earth's gravity?
A) when it gets above the atmosphere
B) when it is half-way there
C) when it is closer to the Moon than it is to Earth
D) It is never beyond the pull of Earth's gravity.
D
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Friction: A baseball player is running to second base at 5.03 m/s. When he is 4.80 m from the plate he goes into a slide. The coefficient of kinetic friction between the player and the ground is 0.180, and the coefficient of static friction is 3.14. What is his speed when he reaches the plate?
A. 4.47 m/s B. 2.89 m/s C. 1.96 m/s D. 2.56 m/s E. He stops before reaching the plate.
During a star's main sequence portion of its life it does not change size appreciably. This observation indicates that
A. the Sun produces about the same amount of energy as it radiates into space. B. the Sun produces less energy than it radiates into space. C. the Sun produces more energy than it radiates into space.
Irregular galaxies, although small, have large H II regions and much on-going star formation for their size
Indicate whether the statement is true or false
The modification of the standard Big Bang theory is known as the
a. cosmic model. b. Hubble-Leavitt model. c. inflationary model. d. Hertzsprung-Russell model.