Harry pulls on the end of a spring attached to a wall. The reaction to Harry's pull on the spring is

A) the wall pulling oppositely on the spring.
B) the spring pulling on Harry.
C) both the wall and the spring pulling on Harry.
D) none of the above


Answer: B

Physics & Space Science

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Dr. Chuck projects a ball horizontally from a lab bench. The ball lands on a bullseye marked on the floor a horizontal distance away

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The rms speed of a certain sample of carbon dioxide molecules, with a molecular weight of 44 g/mole, is 396 m/s. What is the rms speed of water molecules, with a molecular weight of 18 g/mol, at the same temperature?

A) 253 m/s B) 387 m/s C) 421 m/s D) 506 m/s E) 619 m/s

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The Universe is _______________ because it looks the same in any direction you observe it

Fill in the blank(s) with correct word

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How are surfaces of Mercury and the Moon similar? Different? Why?

What will be an ideal response?

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