It is generally believed that there are 7 days in a week because
a. there are 7 stars in the Big Dipper.
b. it is necessary to have 52 weeks in a year.
c. there are 7 visible bodies in the sky that move against the background of the fixed stars.
d. it is easy to multiply by 7.
c
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Objects the size of the one that exploded over Chelyabinsk (Russia), causing significant damage and injuries to more than 1,000 people, probably hit Earth at least
A) once a century. B) once a year. C) once every 500,000 years. D) once every 100 million years.
Before the switch is closed in the figure, the potential across the capacitor is 200 V. At some instant after the switch is closed, the instantaneous current is 0.70 A. What is the energy in the capacitor at this instant?
A. 49 mJ B. 31 mJ C. 80 mJ D. 0.13 J E. 62 mJ
What would be the greatest effect on the ideal gas law if there is a slight repulsive force between the molecules?
A) At low temperatures, the pressure would be greater than that predicted by the ideal gas law. B) At high temperatures, the pressure would be greater than that predicted by the ideal gas law. C) At low temperatures, the pressure would be less than that predicted by the ideal gas law. D) At high temperatures, the pressure would be less than that predicted by the ideal gas law. E) There is no effect.
Which jovian planets in our solar system have rings?
A) Saturn only B) Jupiter and Saturn only C) all but Neptune D) all four of the jovian planets have rings.