Which of the following statements is true?
A) Both the Northern and Southern hemispheres receive the same amount of sunlight on the equinoxes.
B) The Southern Hemisphere receives the most direct sunlight on the summer solstice.
C) The Northern Hemisphere receives the most direct sunlight on the summer solstice.
D) Both the Northern and Southern hemispheres receive the same amount of sunlight on the solstices.
E) Both A and C are true.
E
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The isotope, tritium, has a half-life of 12.3 years. Assume we have 10 kg of the substance. How much tritium will be left after 30 years?
a. 0.20 kg b. 1.8 kg c. 0.18 kg d. 1.7 kg e. 4.1 kg
General Questions: A 75-N box rests on a perfectly smooth horizontal surface. The minimum force need to start the box moving is
A. 75 N. B. 7.5 N. C. 750 N. D. any horizontal force greater than zero.
Gaps in the asteroid belt occur at distances where
A) the density of asteroids was once so high that collisions pulverized the asteroids into dust. B) the period of an orbiting asteroid would be a simple fraction (like 1/3 or 1/4) of Jupiter's orbital period. C) the period of an orbiting asteroid would be the same as Jupiter's orbital period. D) the period of an orbiting asteroid would be the same as Mars's orbital period. E) the orbit would take the asteroid beyond the "frost line" in the solar system.
A person is using a rope to lower a 5.0-N bucket into a well with a constant speed of 2.0 m/s. What is the magnitude of the force exerted by the rope on the bucket?
A) 0.00 N B) 2.0 N C) 5.0 N D) 10 N E) 49 N