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What is the refractive index of vacuum? (40 points)

	undefined
	0
	10
	1
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written by sam • topics: science block unblock • physics block unblock • light block unblock • speed block unblock • general block unblock

491 responses

3 comments

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What is the SI unit of mass? (30 points)

	pounds
	grams
	Smoots
	kilograms
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written by sam • topics: science block unblock • weights/measure block unblock • units block unblock • physics block unblock • Mass block unblock and 1 more » • weights and measurement

871 responses

4 comments

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You have a glass of ice water filled to the rim. When the ice cube floating in the glass melts, the water will... (30 points)

	depends on how big the ice cube is
	overflow
	be lower than the rim
	be at the rim
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written by sam • topics: science block unblock • physics block unblock • general science block unblock • thermodynamics block unblock

799 responses

5 comments

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If you throw a rock directly vertical, what is its acceleration at the very top of its path? (40 points)

	9.8 m/s2 upward
	9.8 m/s2 downward
	infinite
	zero
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written by sam • topics: physics block unblock • science block unblock • Movement block unblock • scienc block unblock

353 responses

6 comments

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What is the speed of sound at sea level (approx.)? (20 points)

	5000 mph (2235 m/s)
	1000 mph (447 m/s)
	500 mph (223 m/s)
	750 mph (345 m/s)
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written by sam • topics: science block unblock • physics block unblock • sound block unblock • speed block unblock • airplanes block unblock and 2 more » • Aircrafts • waves

1231 responses

6 comments

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Falling out of an airplane, which experiences the most drag from air resistance? (30 points)

	a goldfish
	an elephant
	a dolphin
	a human
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written by sam • topics: science block unblock • physics block unblock • animals block unblock • math block unblock • biomechanics block unblock and 1 more » • mathematics

1044 responses

1 comment

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Which best describes the essential components of a laser? (20 points)

	battery, magic, heat
	bulb, lens, aperature
	energy source, gain medium, and resonant cavity
	electricity, pump, lens
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written by sam • topics: science block unblock • Technology block unblock • laser block unblock • physics block unblock • quantum mechanics block unblock

913 responses

12 comments

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An ion pump is used for what? (30 points)

	Space travel
	Heating
	Creating vacuum
	Cutting steel
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written by twopoint718 • topics: science block unblock • physics block unblock • nuclear physics block unblock • Technology block unblock

530 responses

0 comments

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Which is the odd one out ? (20 points)

	Radon
	Potassium
	Neon
	Helium
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written by olpika • topics: science block unblock • physics block unblock • chemistry block unblock

471 responses

2 comments

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In Astronomy, most distances within the solar system are related in AUs. What does AU stand for? (10 points)

	Light Year
	Atomic Units
	Astronomical Unit
	Arghos Unit
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written by bubba2nark • topics: astronomy block unblock • physics block unblock • science block unblock

419 responses

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