When the first solid bits in the solar nebula became large enough to be called planetesimals, what caused them to grow larger more quickly?

a. gravity
b. friction
c. electrical forces
d. pressure


Ans: a. gravity

Physics & Space Science

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Pulsars could not be ordinary stars that are pulsating because the pulses are too short

a. True b. False Indicate whether the statement is true or false

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Which of the following rocks would be the first to weather in a humid climate? Which would be the last? Defend your answers. (a) granite (b) sandstone (c) limestone (d) halite

What will be an ideal response?

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If two coherent waves, one with intensity 8.0 units and the other with intensity 4.0 units, undergo destructive interference, what is the resulting intensity?

A. 4.0 units B. 6.0 units C. -4.0 units D. 1.9 units E. 0.7 units

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Heat is transferred from a substance if it is exposed to something that has a lower temperature

a. True b. False Indicate whether the statement is true or false

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