About what percent of Earth's radius do the crust and mantle together constitute?
a. 15%
b. 70%
c. 45%
d. 30%
c
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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).
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).
Galileo observed satellites orbiting which planet as indirect confirmation of Earth's non-uniqueness?
What will be an ideal response?
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.