The radius of Earth's mantle is about

a. 870 km.
b. 2900 km.
c. 1050 km.
d. 5800 km.


b

Physics & Space Science

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A one-kilogram gold ingot is carried from the bottom of the Eiffel tower to the top, 300 m above ground level. By what amount does its mass change?

A) Its mass does not change. B) Its mass increases by 3.27 × 10-14 kg. C) Its mass decreases by 3.27 × 10-14 kg. D) Its mass increases by 1.64 × 10-14 kg. E) Its mass decreases by 1.64 × 10-14 kg.

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An object requires a force of 30 N to hold it under water. The object weighs 90 N in air. Its density is nearest:

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What type of galaxies do astronomers believe to be the most common?

a. Elliptical b. Spiral c. Irregular d. Astronomers have no idea which type of galaxy is more common.

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The ____________ was a large cyclonic storm in the atmosphere of Neptune observed by Voyager 2

Fill in the blank(s) with correct word

Physics & Space Science