Earth's average density is about _____

A) 5.5 g/cm3
B) 6.5 g/cm3
C) 7.5 g/cm3
D) 8.5 g/cm3


A

Physics & Space Science

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If you take 6 litres of air from the surface to 20 metres/66 feet, the volume will be __________ litres.

a. 1 b. 2 c. 3 d. 4

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In a hydraulic-press operation, it is impossible for the

A) output displacement to exceed the input displacement. B) force output to exceed the force input. C) energy output to exceed the energy input. D) output piston's speed to exceed the input piston's speed. E) none of the above

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Dispersing light from a hot, low-pressure gas gives a spectrum of the type known as (two words) ______________ ______________

Fill in the blank(s) with correct word

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If the north poles of two bar magnets are brought close to each other, the magnets will

A) attract. B) repel.

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