Conversion of Units: There are 640 acres in a square mile, 5280 ft in one mile, and 3.28 ft in one meter. How many acres are there in a hectare, which is a square one hundred meters on each side?
Fill in the blank(s) with the appropriate word(s).
2.47 acres
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What is Hawking radiation?
A) a type of high-energy radiation that comes from inside a black hole's event horizon B) a type of radiation coming from objects supported by degeneracy pressure C) a hypothesized way for black holes to gradually shrink in mass D) a type of radiation that we have detected so far only with infrared telescopes in space
Consider a star with 2 identical planets, both with nearly circular orbits, except the orbit of Planet A is closer to the star than the orbit of Planet B. Which of the following statements is true?
A) Planet A is moving slower than Planet B. B) Planet A moves with the same speed as Planet B. C) Planet A is moving faster than Planet B.
A tropical storm becomes a hurricane when its wind speed reaches
a. 50 mi/h. b. 120 mi/h. c. 74 mi/h. d. 100 mi/h.
Why is our Sun not forming carbon and heavier elements yet?
What will be an ideal response?