| Author | Comment |
gulyman
Goliath
Posted: 15 Apr 2008
14:13 GMT
Total Posts: 144 | In my grade 11 physics we are going over gravity. Here is my problem.
In a vacume, any two objects fall at the same speed towards earth, 9.81 m/s^2. Now on the one hand we have a planet that has a gravity of 30m/s^2. And on the other hand we have another planet of the same volume that has a gravity of 10m/s^2. These planets are 1 meter apart. At which acceleration would these planets approach, the 30 or the 10. |
Zachary940
Wraith
Posted: 15 Apr 2008
16:10 GMT
Total Posts: 714 | Now I'm no physics freak and have only taken an intro class.
With that said I would have to say 30.
My reasoning is that if you have two magnets and one is really powerful while the other one is not, the more powerful one will pull the weak one. Unless you combine the forces so they would approach at 40. That would make more sense to me. Like I said I have no idea what I am talking about. Now if you have a question about networking then thats a different story.
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It is much easier to suggest solutions when you know nothing about the problem. |
Vectris
Ultralisk
Posted: 15 Apr 2008
18:39 GMT
Total Posts: 375 | Zach, If two computers hooked up to the same network are on different planets one meter apart, and one has a gravity of 9.81 m/s^2 and one of 30m/s^s, which network will crash first? lol |
Barrett
Administrator
Posted: 15 Apr 2008
21:12 GMT
Total Posts: 1676 | It's not that simple... although it will likely be much closer to the 30m/s^2... You need the mass of both planets, and the distance from the center of mass to the center of mass... the FORCE will be G*m1*m2/r^2... then to figure out acceleration you need to pick a reference point. G is a constant that you need to look up.
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-Barrett A |
gulyman
Goliath
Posted: 16 Apr 2008
11:33 GMT
Total Posts: 144 | *In this post everything is in a vacuum*
The reason I ask is because on earth all objects fall at the same acceleration, no matter what their mass is. On Jupiter all objects fall at 22.88m/s^2, no matter what their mass is. This is one of those pesky laws that people keep coming up with. But If these two planets were 1 meter apart, from the reference point of Earth, Jupiter would fall towards Earth at more then 9.81m/s^2. This would go against that law.
Now what works on the macro usually works on the micro, at least to a certain extent. With that in consideration, small objects of different masses would accelerate towards earth at minutely different speeds. But that isn't what they teach in high school or say, on wikipedia.
http://en.wikipedia.org/wiki/Uniform_Acceleration
(after the a=g near the top)
There is some difference of opinion.
I think that mass affects the acceleration towards earth, and the teachers at school don't. |
Barrett
Administrator
Posted: 16 Apr 2008
16:13 GMT
Total Posts: 1676 | It's only "no matter what their mass is" because you almost always deal with masses that are millions of times smaller than that of Earth. When you start dealing with objects the size of Texas or larger, you have to take their mass into consideration.
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-Barrett A |
Zachary940
Wraith
Posted: 16 Apr 2008
17:50 GMT
Total Posts: 714 | @B: you are too smart.
@calcproductions: Witch ever one is running windows will crash first.
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It is much easier to suggest solutions when you know nothing about the problem. |
Vectris
Ultralisk
Posted: 16 Apr 2008
18:31 GMT
Total Posts: 375 | hahhaha very nice, you use a mac? or have linux? |
Zachary940
Wraith
Posted: 16 Apr 2008
19:44 GMT
Total Posts: 714 | I run linux
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It is much easier to suggest solutions when you know nothing about the problem. |
gulyman
Goliath
Posted: 16 Apr 2008
21:23 GMT
Total Posts: 144 | I finished my previous post.
What Barrett says makes sense. But all through school they told me that different masses fell at the same speed. Now I have to go over what I know about gravity and stuff and reanalyze it so the nice little model of the universe inside my head works all perfectly.
@Zachary:What distro do you run?
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Barrett
Administrator
Posted: 16 Apr 2008
21:32 GMT
Total Posts: 1676 | The point that they are making in school is that (in a vacuum), a feather and a bowling ball accelerate the same towards the Earth. This is only true because of how little their mass is compared to Earth's. You can assume this for any and all objects that aren't at least relatively large compared to the other object that has a gravitational pull (like the moon or a large comet/asteroid).
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-Barrett A |
Zachary940
Wraith
Posted: 17 Apr 2008
09:31 GMT
Total Posts: 714 | @gulyman: on my laptop i run open SUSE 10.3, then I have two more computers. One runs red hat 9 and the other runs Fedora 8.
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It is much easier to suggest solutions when you know nothing about the problem. |
me2
Goliath
Posted: 1 Jul 2008
12:19 GMT
Total Posts: 171 | The planet with gravity of 30m/s^2 gravity would be about 9 times as massive as the other planet (mass, not size, counts here).Therefore, the equation to use is (9*30m/s^2+10m/s^2)\10=around 28 m/s^2.
@the various people talking about computer systems:I run Linux (Fedora Core 4) and Windows XP on my laptop. Linux is nice for everything except gaming and producing programs for distribution (As most people use Windows, and it doesn't support Linux software very well).
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<--- Going out with a bang. |
