Can you name the answers about physics concepts? by sixtyseveners

Question	Answer	Exlplanation
For a given object on a given surface is the coefficient of static friction or kinetic friction greater?
Centripetal acceleration goes in what direction relative to it's circular path of motion?
If they have the same velocity, which object has more momentum: a car or a feather?
Is every single particle in the universe gravitationally attracted to every other particle in the universe?
What physicist united the five 'versions' of string theory and introduced M theory?
Do photons have mass?
True or False: Scientists will someday be able to construct telescopes powerful enough to see a black hole?
What can a quantity be labeled if it essentially measures volume, and has both direction and magnitude?
What does Newton's first law of motion define? (one word answer)
The Heisenberg uncertainty principle states that you cannot know what two things about an electron?
What will a force acting on an object (not in equilibrium) cause it to do?		F=ma
What units is force commonly measured in?
Which is faster, an object moving at 1 kilometer per hour, or 1 mile per hour
Does a planet with a radius twice that of earth but the same mass have greater or lesser gravitational attraction?

Question	Answer	Exlplanation
The term 'valence' is mostly associated with what particle?
About how long would it take to travel from one edge of our galaxy to the other at the speed of light?
In the equation E=mc squared, what constant does 'c' stand for?		Ask Einsein
About what is the speed of light in meters per second? (in a vacuum)
The average distance from the earth to sun is defined as what unit of measurement? (a meter/lightyear/inch)
What greek letter is used to symbolize wavelength?		It looks a lot like an upside-down 'Y'
Energy is commonly measured in what units?		Energy is tied in with force and work
In the study of momentum there are two types of collisions. What are they?
What type of force causes an object to twist or rotate?
The number of stars in the milky way is estimated at what power of 10? (hundreds, thousands, millions...)
Angular acceleration is described using what greek letter?		It looks similar to an 'a'
What is the metric equivalent to the english degrees? (not temperature)
How many radians complete a circle in terms of pi?		thats just the way it is

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Physics knowledge Quiz

by sixtyseveners

Created Nov 10, 2009 in Science
Game Plays 4,310

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	PBRbateman7:	Nov 11th, 2009 at 01:10 GMT	2 points
	You could probably adjust the column widths to make the outside larger and the center smaller. It would be easier to read that way.

	JasonJP:	Nov 11th, 2009 at 04:28 GMT	-2 points
	Also you could try adding a bit more stuff. Its kinda short. It took me 7 seconds to type everything. Either put more stuff or make the timer 1 minute.

	eurythmech:	Nov 11th, 2009 at 10:16 GMT	3 points
	And you might also want to get Witten's name right.

	Psycho:	Nov 11th, 2009 at 13:53 GMT	2 points
	Centripental acceleration goes towards the center of the circle so you could accept just "center".

	yurmom666:	Nov 11th, 2009 at 16:29 GMT	2 points
	Yeah, no h is Witten.

	sixtyseveners:	Nov 12th, 2009 at 00:28 GMT	0 points
	sure, center is now an accepted answer

	yoshikatsu1508:	Nov 12th, 2009 at 16:43 GMT	7 points
	that last bit, huge mistake, they have the same gravitational force the total gravitation force of an object depends only on its mass, nothing to do with its size, if the sun was to contract into a size less than its own schwarzchild radius it would become a black hole, but the gravitation force provided by this black hole would be the same as the sun

	floyd4one:	Nov 13th, 2009 at 01:14 GMT	7 points
	wow so many issues, where to begin? 1)having true/false and yes/no answers on sporcle is pointless 2)the direction is radial or perpendicular to the motion, inwards is poorly defined in this context 3)i don't know who Ed Witten is, but last name should be enough and it's not really a piece of physics knowledge, more like history 4)displacement has a lot of meanings in physics and vector is probably the least frequent definition. volume is much better (displacement of an engine for example). 5)Newton's laws don't define anything. First law simply describes inertia. 6)why ask for two things if you only need to type on for Heisenberg? 7)a number. force creates acceleration (at least classically) not the other way around and multiplying parameters is a very high-school way of looking at problems. 8)it's not techincally faster, it's actually faster... 9)gravity question is just plain wrong lots of work needs to be done on this quiz...

	sixtyseveners:	Nov 13th, 2009 at 01:20 GMT	0 points
	Make a better one. Ill give it a shot.

	micah:	Nov 13th, 2009 at 23:14 GMT	6 points
	Yeah, you really need to clarify for your gravity question that you're asking about gravitational attraction at the surface of the planet--gravity at any given distance from the center is of course independent of the planet's radius.

	micah:	Nov 13th, 2009 at 23:15 GMT	5 points
	Also, your black hole question isn't necessarily right, because of Hawking radiation.

	Landowns:	Nov 16th, 2009 at 04:20 GMT	2 points
	For the vector question, I would include that it has a direction and magnitude.

	ceiiinosssttuu:	Nov 16th, 2009 at 05:12 GMT	3 points
	Not enough time!

	robinguy19:	Apr 8th, 2010 at 14:24 GMT	3 points
	definitely not enough time

	TeganX7:	Jul 4th, 2010 at 07:37 GMT	4 points
	Kudos for the effort, but volume is not a vector quantity ... a planet at double the radius would have less gravity at its surface (compared to Earth), but could have different strengths of gravity, depending on the distance from its center a particle is placed ... I put 99,000 years to get across the galaxy, which is >about how long< it would take. Torque is >not< a force. Radians is not a metric equivalent to degrees ... there are perfectly elastic, perfectly inelastic, and then collisions which are some degree of inelastic (imperfectly elastic). Energy can be commonly measured in electron volts, BTU, kilojoules ... in the US kilowatt-hours is pretty common.

	simpleerrors:	Sep 13th, 2010 at 02:53 GMT	1 point
	The way I learned it, location and position could be used interchangably? is that so? (for the heisenberg question)

	blablooblah:	Sep 23rd, 2010 at 05:46 GMT	1 point
	um, yes there are a lot of issues, but overall good job, I would take huge issue with the gravity one, by the way, he could be right depending on the position of where you're measuring the gravity, but you'd have to be inside the bigger planet for it to make a difference, the formula for gravity is something like GmM/r^2, so maybe you got confused by the r, but that refers to the place you're measuring the gravity, nowhere in there is density. I also have huge issue with the particles bit, you realize that you contradict yourself when you say that all particles act on each other gravitationally, but than say there are massless particles, which do not exert gravitational force. Now, of course light can be bent by gravity, but it is not light but space that is being deformed in that case...

	ledwix:	Oct 31st, 2010 at 09:47 GMT	1 point
	I seriously tried Whitten, Wittman, Witten, Whitman, everything. Nothing worked.

	TIGERHULL:	Mar 7th, 2011 at 10:53 GMT	1 point
	Accept more answers, I tried orthogonal, perpednciular, inward, right angle, only to find I should have written inwards. Answers asking how many stars etc. are also pointless.

	HarryNJ:	May 23rd, 2011 at 04:57 GMT	2 points
	One more minute would be good. There are a few where it takes a few seconds to figure out exactly what is being asked.

	limitsuperior:	Jun 6th, 2011 at 20:47 GMT	1 point
	For the question where you ask if every particle is attracted to every other particle- what about massless particles?

	yimaster:	Jun 9th, 2011 at 23:56 GMT	2 points
	if you're asking for a quantity in meters per second, accept the number in number or written form, don't make us write out meters per second. Also, why the extraneous meter/lightyear/inch information on the unit of measurement for earth-sun. It just makes an unclear question even more unclear since several other questions were multiple choice

	Sopz:	Jun 19th, 2011 at 17:10 GMT	1 point
	accept standard form for speed of light also more time

	aangenaamjazz:	Sep 22nd, 2011 at 16:38 GMT	1 point
	Bad quiz. Most comments above already mention the weaknesses. If you ask for a unit, you should have the singular form count correct too (newtons, radians). A quantity that measures volume is a vector quantity? What nonsense is that!

	Nordeck52:	Apr 17th, 2012 at 22:44 GMT	1 point
	Accept 3e8 or 3x10^8 for the speed of light!