Rest Definition and 549 Threads

do particles of the standard model have rest mass that is quantized, and comes in quantas of mass, with i imagine the electron being the lowest that have rest mass (the neutrino does not appearl to have a rest mass) ? please move to other more appropriate forum

I am taking too many AP classes plus I am in a chess club. Now what happens is that even though I have an A so far in all of my subjects. I can't get rest. Literally, I study till my mind starts burning, then when it gets really hot, I jump in the swimming pool for half an hour, then study...

Why is the relation between an electrons rest mass inversely proportional to its distance from the nucleus (sp)? Thanks, -scott

Defining Gravity - Give it a Rest! As usual the scientific explanations are all totally off the wall; nothing but whimsical flights of imagination by delusional pseudo-intellectual kooks who base their pretentious propositions on foundations of their own fatuous utopian conceptions. The most...

I have some trouble with this electromagnetism problem: I need to transform the four-potential of a magnetic dipole at rest, in order to obtain it's value in a reference frame (I understand it's the Lab frame) where we see the dipole moving at v. I know what the magnetic vector potential is...

I need help with this question if anyone can give me an idea of what to do. Any help would be greatly appreciated. An electron is released from rest in a uniform electric field. The electron accelerates vertically upward, traveling 4.50 m in the first 3.00 micro seconds after it is released...

hi please can sum one help me, a stone is dropped from he top of a cliiff at rest another stone it thrown downwards from the same point at 11ms-1. The two stones land at the same time, what is the height of the cliff,:frown: how do u work this out i have no idea,:cry: thankyou in...

This to me means that everything is moving *through space* in some form or another. If we can calculate a slowest object it would be like finding a fastest time. Einstein dared not say it. If moving through space is what slows time then time can be both absolute and relative. The Fastest...

kayyy these are some hwk questions i don't understand. please help :cry: 1. A person has a choice of either pushing or pulling a sled at a constant velocity. Friction is present. If the angle beta is the same in both cases, does it require less force to push or pull? explain. I believe...

A small crate of weight 5.0N is released from rest at a height 2.0m up a smoyj inclined plane. The crate slides down the plane and across a smooth 1.50m floor to a rough plane where a spring is located. The bottom of the spring is located at a height of 0.5m. The spring constant is 20N/m ...

A car slows down from a speed of 26.0 m/s to rest in 4.50 s. How far did it travel in that time? What equation do i use?

Why is the rest energy mc^2 of an electron or positron 0.51 MeV? Because if it's not moving, why is there "c"?

How does momentum factor into the force applied to an object at rest hit by another which is moving?

How does E = mc^2 imply that no object with rest mass can ever reach the speed of light?

Here is the question: An armada of spaceships that is 1.00 ly long (in its rest frame) moves with speed .800c relative to a ground station in frame S. A messenger travels from the rear of the armada to the front with a speed of .950c relative to S. How long does the trip take as measured...

An interesting time dilation experiment I thought of was to send a radio signal with two pulses a certain time apart to a receiver moving toward the emitter. I believe that the effect is that the accelerated reciever undergoes time dilation and would time the two pulses of light as closer...

I'm still very confused to some extent. I know that from QM, an electron, due to Heisenbergs UP can't be measured definitely. It is following Schrödingers equation, and is presented as a vector in Hilbert space ,i.e. in a "electron cloud" of propability. But here my theory is incomplete...

Suppose there is a 2600kg stone block on a ramp inclinded at 12 degrees to the horizontal.Assume that each worker can exert a pulling force of magnitude at most 360 Newtons. a) Determine the number of workers it would take to hold the stone block at rest b)Although lubrication can reduce...

Separation of Church and State..."May God Bless"...the rest of us? In the wake of the 2004 election, last count was that the IRS was investigating 60 religious organizations for endorsing Bush from the pulpit. The mixing of religion in politics has become a much more serious problem then most...

Fill in the question marks. 0 1 1 1 1 1 1 1 0 0 1 2 2 2 2 2 1 0 0 1 3 4 4 4 3 1 0 0 1 4 6 7 6 4 1 0 0 1 5 8 9 8 5 1 0 0 1 6 9 10 9 6 1 0 ? ? ? ? ? ? ? ? ? ? ? ? ? ...

relativistic mass is defined by the lorentz contraction equations (i.e time & legnth). but why should mass increase only for speeds very close to c? is there any theory that explains this? we know that rest mass is basically the resistance to acceleration and the higgs theory postulates...

A 59.0kg box hangs from a rope. What is the tension in the rope if The box is at rest?

Hi, i just finished my first semester in physics, going pretty good, so i assume that i will finish my bachelor after the normal 3 years. But the thing is, I'm an aspiring athlete as well, and I've been wanting to move to USA and train there for 1-2 years intensly and see if i can get anywhere...

Can an electron be at rest?

what is rest mass? why does a photon have rest mass zero? :rolleyes:

a moving particle has a rest mass which is double its kinetic energy. Find its speed and momentum..=)

The electron, having been held at height h0, is now released from rest. Calculate its speed v when it reaches the top plate. I found the initial energy to be: -q_e*E*h_0 and the final energy to be: 1/2*m*v^2+-q_e*E*h_1 And I need to solve for v, so I set the two equal to each...

Hi, I'm looking into electromagnetic radiation at the moment and something has just entered my head. If its true that an electron will not radiate unless its velocity changes with time then could this property be used to determine absolute rest. That is, how can we know that if something is...

Hi, got an exam tomorrow for particle physics and need a question answered concerning helicity. How would it be possible to determine if a photon had a non-zero rest mass, based on measured helicity values? Thanks Ray

A disk 8.0 cm in diameter is initially at rest. A small dot is painted on the edge of the disk. The disk accelerates at 600rad/s^2 for .5s, then coasts at a steady angular velocity for another .5s. What is the speed of the dot at t = 1 s? Through how many revolutions has it turned? I...

a hockey puck of mass m is sliding in the +x direction across a horizontal ice surface. while sliding, the puck is subject to two forces that oppose its motion: a constant sliding friction force of magnitude f, and a air resistance force of magnitude cv^2 , where c is a constant and v is the...

I'm a New Yorker, and I visited Montreal this summer on vacation, and I just wanted to know how it compared to other Canadian cities. So, could some friendly Canadians tell me whether or not most of the things I noted about Montreal are common to other Canadian cities? - It seemed like...

Q: A bag of cement of weight 339 N hangs from three wires as suggested in the figure below. Two of the wires make angles and with the horizontal. If the system is in equilibrium, find the tensions in the wires? The answer requires T1, T2, T3. I know T3 = Fgravity = 339N. I made a...

If it's energy, a photon must curve space. If it's rest mass a photon doesn't curve space and an object going at speed 0.99c doesn't curve space more than when it's not moving. A friend of mine asked me this question after asking two of his profs at McGill University and getting two...

Would a massless spin 2 boson traveling at light speed collide with a fermion to yield particle-antiparticle pairs (if the spin 2 was a graviton the particles would have to have a very small mass so far undetected by science)? Could this spin 2 boson be electromagnetic in nature? Could a...

Anyone- From long ago IIRC a body that transitions from a rest state to a rectilinear moving state undergoes nearly infinite jerk (change in 'a'). On the one hand, my memory is reinforced by the idea that not all functions have infinitely many derivatives... But on the other hand, I may not...

Well, we have gone this far, and since we have shared so much with so many of you already, I wanted to share a little from our beloved and now dearly departed that we have mentioned on numerous occasions. Most of them lived 12-14 years, less Bun II who only lived 4.5, and Yiddo who lived 19...

Are Higgs particles all the same mass? Does a proton have more Higgs particles associated with its rest mass than an electron has associated with its rest mass? And does the mass of all Higgs particles equal the total rest mass of the universe? Do Higgs particles have short lifetimes like...

Back in 1960's ,one could frequently hear opinions/claims that neutrino rest mass is 0.Not a very small one ,but exactly=0.Therefore,a nutrino would just like photons propagate at light velocity through the space. What has changed in a meantime (since decade -two), except better insight to...

List of reccomended reading for string theory includes- 'A Proposal About the Rest Masses of Quarks' by Jiao Lin Xu Using String Theory the rest mass of quarks is given as- u=930, d=930, s=1110, c=2270, b=5530 The average rest mass of the figures given by the (international) Particle...

a billiard ball traveling 4.0m/s has an elastic head on collision witha billiard ball of equal mass that is initially at rest. the first ball is at rest after the collision. What is the the speed of the second ball after the collision? [b(] Kim

Particles having nonzero rest mass can approach, but not reach, the speed of light, since their mass would become infinite at that speed. Can anyone expound upon this commencing with the very fundamental concepts (nonzero rest mass, mass, inertia, infinite mass etc.)?

We set speed v=0 all the time in physics, and reach neat and tidy conclusions, but can anything really be at rest? I am interested in criticisms to the following line of reasoning: Definition of momentum \vec P = mass*velocity = M \vec v And from this it follows that the magnitude of...

I have two problems for homework that I just can't seem to figure out. Can someone please help me?! Thanks. 1) A jet transport has a weight of 2.97 x 106 N and is at rest on the runway. The two rear wheels are 17 m behind the front wheel, and the plane's center of gravity is 13.1 m behind the...

Problem 10. A 0.50 kg object is at rest. A 3.29 N force to the right acts on the object during a time interval of 1.60 s. At the end of this interval, a constant force of 4.07 N to the left is applied for 2.75 s. b. What is the velocity at the end of the 2.75 s? Answer in m/s. Note: Is...

the question what is the average acceleration of a car that goes from rest to 69 km h in 9 seconds; don't i use the formula a = vf-vi over t vf - 59 / 9 what is the correct final answer 16.5 km

[SOLVED] the nature of electric magnetic radiation,it's rest mass and potential to sl Some people look at light as photons I look at light simular to radio waves except at a higher frequency,so if you analyse light from the point of from radio waves you get a much better picture as to...

hi can you help me with these two exercises please question 1 a 1490 kg car is moving with a steady speed of 88km/h at a constant height h above the ground on a slop track with an inclination angle to the horizontal. if there is no side force on the tyres determine(a)the radius of curvature...

I don't know if this necessarily belongs in the philosophy section, but we'll try it on for size. So as you all know, we use maybe 10 percent of our brain's capacity(some use considerably less, but that's another topic:wink:). Einstein purportedly used maybe 20% of his brain(this may be an...