A 15-?F capacitor and a 25-?F capacitor are connected in parallel, and charged to a potential difference of 60 V. How much energy is then stored in this capacitor combination?
A. 50 mJ
B. 18 mJ
C. 32 mJ
D. 72 mJ
E. 45 mJ
Answer: D
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According to our present theory of solar system formation, why were solid planetesimals able to grow larger in the outer solar system than in the inner solar system?
A) The solid material that accreted in the outer solar system included ices, while the solid material of the inner solar system consisted only less abundant metal and rock. B) There was more time for accretion in the outer solar system before the solar wind cleared the nebula away. C) The gas in the outer solar system contained a larger proportion of rock, metal, and hydrogen compound than the gas in the inner solar system. D) Gravity was stronger in the outer solar system, allowing more solid material to collect.
Any model of solar system formation must explain why comets come from the Oort Cloud, with orbits very different from the planets, asteroids, and Kuiper Belt Objects
Indicate whether the statement is true or false
Which of the following best describes the current status of the debate over evidence for life in the Martian meteorite ALH84001?
A) Most scientists now agree that the meteorite shows clear evidence of past life on Mars. B) Most scientists now agree that the meteorite shows no evidence for past life on Mars. C) Most scientists agree that the evidence would support life if the meteorite truly comes from Mars, but few scientists accept that the meteorite is from Mars and instead think it is an ordinary Earth rock. D) Most scientists find the evidence intriguing but suspect that it can be explained without requiring past life on Mars.
The moon pulls on the Earth with one-sixth of the force of the Earth exerts on the moon
Indicate whether the statement is true or false