About what percent of Earth's radius do the crust and mantle together constitute?

a. 15%
b. 70%
c. 45%
d. 30%


c

Physics & Space Science

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Galileo observed satellites orbiting which planet as indirect confirmation of Earth's non-uniqueness?

What will be an ideal response?

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The "aspect ratio" of thickness to width of the Galactic disk is about

A) 1:2. B) 1:5. C) 1:10. D) 1:100. E) 1:1,000.

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Initially, the light puck is moving west at 4 m/s while the heavy puck is moving south at 2 m/s. The final velocity of the conjoined pucks is

A. West. B. South. C. Southwest. D. Zero. E. Some other direction (explain).

Physics & Space Science

Power: A 100%-efficient engine is being used to raise a 89-kg crate vertically upward at a steady rate. If the power output of the engine is 1620 W, how long does it take the engine to lift the crate a vertical distance of 18.7 m? Friction in the system is negligible.

Fill in the blank(s) with the appropriate word(s).

Physics & Space Science