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/cgi-bin/YaBB.pl General Category >> The Cafe >> That is heavy.....man! /cgi-bin/YaBB.pl?num=1368192826 Message started by Dave on 05/10/13 at 06:33:46 |
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Title: That is heavy.....man! Post by Dave on 05/10/13 at 06:33:46 Before I went to bed the other night......I watched a bit of Steven Hawking on the educational channel. He was talking about the universe and the mutual attraction of bodies of mass.....also known as gravity. If 2 objects are attracted to each other....in the absence of friction or other influences they will move toward each other. That movement will be proportional, so if one body is twice the weight of the other....the lighter body will move twice the distance of the heavier body. So.....the lighter body will move 2/3rd the distance and the heavy body will move 1/3rd the distance. I don't have a problem with this.......until he pointed out. When an apple falls from a tree, the apple falls toward the earth....and at the same time the earth moves toward the apple! :o The distance that the earth moves toward the apple is imperceptable and conforms to the ratio of the apple mass to the earth mass......but it does move! Wow! |
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Title: Re: That is heavy.....man! Post by apache snow on 05/10/13 at 06:58:55 Right... :-? |
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Title: Re: That is heavy.....man! Post by verslagen1 on 05/10/13 at 07:04:50 what he say about when the 2 collide? |
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Title: Re: That is heavy.....man! Post by youzguyz on 05/10/13 at 07:12:33 53405756494442404B14250 wrote:
applesauce.. ;D |
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Title: Re: That is heavy.....man! Post by sbrice54 on 05/10/13 at 07:20:24 So how come the skinny chicks don't move toward me???? |
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Title: Re: That is heavy.....man! Post by Blinky-FSO on 05/10/13 at 07:21:08 Let's test this out. I have a bag of Gala apples so everyone grab hold of something. 8-) Dave, I am pleased to hear the bike fired up. Waiting for pictures and a report of your planned trip to the big bell on Saturday. If the weather holds, I am scheduled for a BRC2 course Saturday afternoon on the new to me 2007 C50. I have not had the opportunity to practice any slow maneuvers on it yet and am somewhat apprehensive about dropping a 600 pound bike. So, if you feel the earth jumping slightly in the direction of Georgetown Kentucky Saturday afternoon, you will know it was me losing it in the u-turn box. |
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Title: Re: That is heavy.....man! Post by RatdogWillie on 05/10/13 at 07:26:13 It's very simple since Newton's first and second laws, embodied in Fnet = ma. The net force, Fnet on a body of mass m causes it to have acceleration a. Newton's third law. FAB = -FBA. If body A exerts a force on body B, then B exerts an equal size and oppositely directed force on A. The definition of torque, t = r´F, where ´ is the vector (cross) product operator. The rotational analogue of Newton's law: tnet = Ia where I is moment of inertia and a is angular acceleration. The definitions of displacement, velocity, acceleration and force as vectors, and the fact that the law of vector addition applies to them. The definition of momentum, p = mv. It is a vector and the law of vector addition applies. The definition of work, W = F•x, where x is displacement and • is the vector scalar (dot) product operator. Work is a scalar. The definition of kinetic energy, Ek = (1/2)mv2. Kinetic energy is a scalar. The work-kinetic energy principle: Wnet = DEk in a closed non-dissipative system. The Wnet is the net work done on the system by all external influences. Conservation of net mass in a closed system (classical physics). Conservation of net momentum in a closed system. Conservation of net energy in a closed system. Conservation of net angular momentum in a closed system. The thermal energy principle: Q = DU in a closed system, where U is the internal thermal energy and Q measures the thermal energy transfer in or out of the system. (In older books thermal energy was called "heat".) The first law of thermodynamics. DU = Q - W where U is internal energy, Q is the thermal energy added to the system, and W is the work done by the system. This is the usual sign convention. The second law of thermodynamics. This has several equivalent statements, but one is that no heat engine can have an efficiency greater than that of a Carnot engine operating between the same two temperatures. That maximum efficiency of any engine is therefore e = (Th - Tc)/Th, where the Ts are absolute temperatures of the reservoirs. Note that this efficiency is always less than one since absolute temperatures are always positive (greater than zero). The third law of thermodynamics. The entropy of a closed system never decreases over time. That should clear up any doubts you may have on this matter |
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Title: Re: That is heavy.....man! Post by Dave on 05/10/13 at 07:32:11 :o :-/ :o :-/ :o :-/ :o :-/ :o :-/:o :-/ :o :-/ :o :-/ :o |
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Title: Re: That is heavy.....man! Post by RatdogWillie on 05/10/13 at 08:48:32 2332223933356564500 wrote:
Most mathematicians would consider the case of a skinny chick accelerating toward a massive object, say the floor, or a wall or yourself as a collision that is nearly or totally elastic. In the totally elastic collision, the skinny chick loses no kinetic energy in the collision, so her speed after collision is the same as before the collision. Seldom does one consider how conservation of momentum is satisfied in this problem. They should, for the analysis is instructive. Analyzing this may also give some insight into why energy, momentum and the conservation laws took so long to be formulated, since the concepts are subtle. Consider a skinny chick of mass m colliding elastically with a stationary object of larger mass M such as yourself. Draw the picture before and after the collision. The conservation equations are: mv1 = mv2 + MV2 (1/2)mv12 = (1/2)mv22 + (1/2)MV2 where v1 is the initial velocity of the smaller ball, v2 is its final velocity after collision, and V2 is the velocity of the larger mass after the collision. Multiply the energy equation by 2 to eliminate the (1/2) factors. mv12 = mv22 + MV2 Divide this by m on both sides. v12 = v22 + (M/m)V22 Randomly rearrange = v12 - v22 = (M/m)V22 then Divide the momentum equation by m on both sides = v1 = v2 + (M/m)V2 then rearrange and square both sides = (v1 - v2)2 = (M/m)2V22 . Next multiply by (M/m) and combine with [7] to eliminate V22 = (M/m)(v12 - v22) = (v1 - v2)2 . That leaves a simply step of multiplying both sides by (m/M) = (v12 - v22) = (m/M)(v1 - v2). Logic tells us that we must now take the limit as (m/M) which goes to zero shown as (v12 - v22) = 0 . Therefore one solution of this attractionless problem is v1 = -v2. Another solution is v1 = v2, corresponding to the case where the two objects do not attract at all. Solution – this problem of attraction may not necessarily be solved by change in the skinny chicks momentum which could be perpendicular to you, or by affecting only the skinny chicks velocity component (speed velocity). The solution may well involve toothpaste, deodorant, or attire or not. I hope that I have been helpful in this matter. |
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Title: Re: That is heavy.....man! Post by justin_o_guy2 on 05/10/13 at 08:57:11 That was a Great answer! Now,, Ive been pondering (& Ive had someone even show me the math) how to figure out velocity of a falling object. That whole 32'/sec/sec thing,, Just seems to me that at the end on 1 second, it otta be Going 32'/sec And have fallen 16 feet. |
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Title: Re: That is heavy.....man! Post by thumperclone on 05/10/13 at 09:10:46 6C7D6D767C7A2A2B1F0 wrote:
too much friction |
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Title: Re: That is heavy.....man! Post by Serowbot on 05/10/13 at 09:14:40 Whenever I'm falling,.. I try very hard not to distract myself with math... :-?... |
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Title: Re: That is heavy.....man! Post by justin_o_guy2 on 05/10/13 at 09:42:12 Any time I am in a place I Could fall I always carry a piece of water hose. Everybody knows you cant move a hose more than 3 feet before it hangs up on Something! |
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Title: Re: That is heavy.....man! Post by ToesNose on 05/10/13 at 10:35:09 687771766B6C5D6D5D65777B30020 wrote:
HAHAHAHA ;D |
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Title: Re: That is heavy.....man! Post by apache snow on 05/10/13 at 10:40:07 One of my old riding buddies used to say he got so drunk last night that he had to hold on to the grass to keep from falling out of the front yard. :o |
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Title: Re: That is heavy.....man! Post by Dane Allen on 05/10/13 at 11:03:07 5C4D5D464C4A1A1B2F0 wrote:
In my experience, they already have a large, overbearing mass in orbit that deflect stray foreign bodies, such as myself. My orbit usually gets altered because as I get closer I can see the Skinny Chick has obviously been cratered alot and is not worth orbiting. |
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Title: Re: That is heavy.....man! Post by RatdogWillie on 05/10/13 at 11:44:55 475647454E4355484951260 wrote:
Wow! That's scarey, but funny! ;D |
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Title: Re: That is heavy.....man! Post by LostArtist on 05/10/13 at 12:04:49 but the earth is a circle, sphere even, so stuff is falling to the ground all around it, do they all cancel each other out? |
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Title: Re: That is heavy.....man! Post by Dave on 05/10/13 at 14:35:26 62415D5A6F5C5A475D5A2E0 wrote:
Only if they have the same mass, fall from the same height, and fall at the same instant. Actually the earth is responding and moving all the time....but it is averaged out and always will be imperceptible. That is until the BIG one comes along! |
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Title: Re: That is heavy.....man! Post by RatdogWillie on 05/10/13 at 15:04:54 73504C4B7E4D4B564C4B3F0 wrote:
According the Irvins Law of Shocking Electrics, electrons will always fall to ground (known in certain circles as earth ground) as long as the circuit is complete or short and the path has the least resistance measured Olms or Oh-M's (You must pick up one or the other though neither of them are to be what they claim and if you're lookin' to get silly, you better go back to from where you came). This is especially true when gravity fails and negativity won't pull then thru.The only variance in this law is when Protons are present and demand payment for sexual favors which is considered unlawful and subject to arrest. Arrested Protons create resistance which cloggs up the works and slows things down thus creating a more relaxed atmosphere. When the atmosphere becomes more relaxed and tensions dissipate, then motorcycling becomes a more pleasurable experience thus canceling out negativity. I'm positive. (Now if you see Saint Annie, please tell her thanks a lot!) |
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Title: Re: That is heavy.....man! Post by raydawg on 05/10/13 at 15:45:16 This sorta reminds me of the Polish Aeronautical Administration claim it would be the first to launch and land on the sun. They claim its energy can then be utilized to power up everything without having to chance Nuclear contamination or polluting the atmosphere the way fossil fuel does.... When queried about the concern of "burning up" any spacecraft as it hurdled toward the sun they replied, "We will go at night" :-? |
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Title: Re: That is heavy.....man! Post by stinger on 05/11/13 at 03:03:19 Thats some pretty heady thinking! You sure you guys are real bikers? Most bikers I know, think gravity is something you put on your mashed potato's! |
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Title: Re: That is heavy.....man! Post by RatdogWillie on 05/11/13 at 04:28:05 6C6B7671787A6D1F0 wrote:
Gravity is the reason kickstands were invented. |
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