Neglecting gravity, doubling the exhaust velocity from a single stage rocket initially at rest changes the final velocity attainable by what factor? Assume all other variables, such as the mass of the rocket and the mass of the fuel, do not change
a. The final velocity stays the same.
b. The final velocity doubles.
c. The final velocity increases by a factor of 0.693.
d. The final velocity increases by a factor of 0.310.
b
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Of all the terrestrial planets, ________ has the largest daily temperature variation.
A. Earth B. Mars C. Mercury D. Venus
Object A is more massive than object B. Which of the following statements is true?
A. Both object A and object B experience the same gravitational force. B. Both object A and object B experience the same gravitational acceleration. C. Object A experiences a greater gravitational force and gravitational acceleration than object B.
The number of daylight hours at any place on Earth's oceans depends on the ______________ and the ______________ of the year
Fill in the blank(s) with correct word
Why doesn't a small piece of uranium go naturally into a chain reaction?
a. Because none of its nuclei fission without bombardment from human-controlled sources. b. Because only large chunks of uranium do this naturally. c. Because in a small sample, too small a fraction of neutrons released from each fission are captured to trigger another reaction. d. Because a small piece of uranium is mostly uranium-238. e. Because even a small chunk is too large to sustain a chain reaction.