The highest tides occur when
A) the Sun and the Moon are on the same side of Earth.
B) the Sun and the Moon are on opposite sides of Earth.
C) the Sun, Moon, and Earth form a right-angled triangle with Earth at the 90° vertex.
D) the Sun, Moon, and Earth form a right-angled triangle with the Moon at the 90° vertex.
E) the Sun, Moon, and Earth form a right-angled triangle with the Sun at the 90° vertex.
A
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Olber's paradox states that the ____
a. Universe must have a center, but not an edge b. sky should be as bright as the surface of a star in all directions c. Universe should have an edge, but not a center d. Earth should be at the farthest point in the Universe from the big bang. e. Universe is not infinite, but cannot have an edge or center
Why might it be difficult for Earth-like planets to form around Sun-like stars in the inner parts of the disk of our galaxy?
A) any stars would be sucked into the central supermassive black hole B) there would be insufficient amounts of heavy elements C) the stars would be packed together too densely for planets to be stable D) there would be too much harmful radiation
At noon on June 21, the Sun is directly overhead at a latitude of
a. 23.5°N. b. 23.5°S. c. 32.5°N. d. 0°.
Which of the following is true?
1.1 calorie = 1 Calorie 2.1000 calories = 1 Calorie 3.1 calorie = 1000 calories 4.1 Calorie = 4.186 J