# PaulS1950

Senior Members

206

1. ## Light has mass?

This is an assumption made about untested data. No one has determined the properties of the Higgs Boson or the higgs field. No one knows what effects the field may or may not have - it is all conjecture. Paul
2. ## Proper Mass redux

Since the photon can't exist at rest you are right; the REST mass of a photon is zero. If you don't exist your mass is also zero. A photon, in its natural frame, has mass because of its velocity (at least). Paul
3. ## Gravity and light

It is mass and energy that affects the spacetime not gravity. Gravity is what we call the effect of bent spacetime. Paul
4. ## Proper Mass redux

$E=mc^2 + pc$ from $E^2 = m^2c^4 + p^2c^2$ by finding the square root of both sides of the equation. so $m=E/(c^2+pc)$ Since the photon exists only at the speed of light it is as improper to find the "rest" mass as it is to find your personal mass at c...... Both are meaningless. The only mass for a photon that has any meaning is the relativistic mass. Paul
5. ## Light has mass?

If the momentum is E/c then the mass is$E/c^2.$
6. ## Light has mass?

So you start with the assumption that the mass is zero in an equation to find the mass? How absurd is that? If I assume the mass is $10 ^-1000000000000$ then I will "prove" that it does have mass. Start with the values of momentum and / or energy of a photon within its reference frame and calculate mass only from that data.
7. ## Proper Mass redux

How much mass would you have if you did not exist? How much mass would you have at the velocity C? A photon has mass because it is at velocity C. Taking it out of that reference frame is the same as my first question in this post. The second question is as meaningless as an at rest photon. Neither can happen.
8. ## Light has mass?

$E^2= m^2c^4+\mathbf{p}^2c^2$ reduces to $E= mc^2 + \mathbf{p}c$ not E=pc you seem to be missing part of the formula?
9. ## Proper Mass redux

The frequency adds mass? I believe that mass times velocity is momentum.
10. ## Proper Mass redux

We all know that you can't use zero when multiplying or dividing - it isn't proper math because zero is valueless. If p=0 then it has no meaning. cp = 0 but you don't get zero because p = x>0. If you multiply infinity by zero you still get zero (no infinity's) What is the value of p in E=pc? it has to be >0
11. ## Imagine what life could be in some higher dimension?

I knew it! spiders are from the 5th dimension - they have eight eyes with which to percive depth in 5 dimensions.
12. ## Proper Mass redux

The only reason a photon has energy or momentum is because of its velocity. "At rest" there is nothing - the photon can't exist. Therefore it is meaningless to have a discussion about the mass of an object that doesn't exist. Of course it has zero mass - it isn't there! Since its velocity is a function of its existence then we have to calculate its, energy, momentum and MASS in that reference frame. What is the mass of a photon traveling at C? What is the mass of a billion photons travelling at C? The momentum is a billion times higher than one... If a photon has energy and momentum then it MUST have mass (even if it is a result of its velocity which is a function of its existence). If M=0 then MC^2 =0 it cannot have kinetic energy (it does) and MC=0 it cannot have momentum (it does), it follows logically and mathmatically that a photon must have mass. M cannot be zero. Paul
13. ## helium scale weight

Using a perfectly balanced beam which pivots at its center on a frictionless pivot, one side of the beam resting on the scale and the other end attached to the balloon filled with helium your scale will measure the net lifting force of the balloon. The net lifting force will be equal to the pressure density of the atmoshere (under test conditions) minus the pressure density of the helium minus the mass of the balloon. Paul
14. ## Light has mass?

We all agree that light has momentum. (m for notation sake only - Mass will use M) We all agree that it has a velocity of C. The mass of an object is the momentum divided by its velocity. (in units weight time interval) (foot pound seconds for projectiles) This is converted to slugs or newtons by way of reducing weight to mass. Without assuming a mass what is the momentum of a photon? now for the sake of measuring the very small let us use a scale that that multiplies the number (not the actual momentum just the number used to define it) by 1000000. We can call this scale nx's and note that a proton would have many millions of nx units as its mass. so, take the momentum of a photon, multiply by 1000000 and divide by C. What number do you end up with?
15. ## is it possible for a spring powered automobile?

Not unless you find a way to bend or break the laws of physics. You can run an engine at a "most efficient for mileage" range of RPM but you cannot use it to efficiently wind a spring and then run a car with it. The engine has to put out more torque than the spring produces, otherwise it wouldn't be able to wind it up. The the car running on the spring would have less power than it took to wind it so more loss. Short version is that it always take more power to operate a system than it produces. Running alternaters on the wheels of an electric car doesn't work because you ave to have enough power to run the alternators and move the car. alternators are 90% efficient (they produce 90% of the watts that it takes to spin them) an electric motor only produces 90(~) % of the power that is fed into it. If you use a gas engine to run an alternator to run an electric motor you have the losses of the gas engine plus the 19% loss in the electrical system. If you are running a controller for the electric motor then it also consumes power. At the end of the day, month, year, decade or century nothing is free. There are always losses. you have to use more energy to produce motion than the motion can provide in energy.
16. ## is it possible for a spring powered automobile?

You are adding losses in your diesel/spring engine. It takes more power to wind the spring than you can get out of it so you add the 30% efficiency of the diesel to the 70% efficiency of the spring and you get around 21% efficiency from the system. You would do better to use the diesel alone. Paul
17. ## Sound Illusions

If the space is very quiet you can produce noise with a fan that the brain will try to make sense of and it sounds like a group of people talking very low. You can't actually pick out individual words but it can be quite real. The mind tries to make sense of just about all inputs. That is why we see "animals" in cloud formations, "monsters" in the dark, flashes when we close our eyes. Try to take advantage of that and your job will be easier. Paul
18. ## Creation of the universe

The pyramids were built a layer of rock at a time. The passages were "vacancies" in the layers as they were built. That is why they could be built without the aid of artificial light. The Egyptians did not build a huge pile of rocks and then hollow out the passages. Paul
19. ## Cloud Computing

The problem with the Cloud movement is the potential to charge for it. If all your apps are on-line then you have to have internet to get there and the server or "owner" of the software that you use can charge you a limited license fee to use them. This is already happening in Japan and I see it happening here too. I will continue to keep everything I use on my computer's hardware and continue to use open source software. There is no substitute for the freedom of having it yourself. As for security, its not really an issue. The most secure sites in the world get hacked so if someone wants my computer they can get it - even with two firewalls and a router between me and the rest of the world. There just isn't much on my computer that means that much to anyone else. Paul
20. ## Microsoft Security Essentials

It works fine on my 64 bit win7 system. Paul
21. ## Bridge designs - how about floating bridges

Glad to be able to help. I know they are not rare but we happen to have these three in the NW part of Washington State. Paul
22. ## Any1 wanna help me with a new concept

OK, I'll bite, What is it, what is the function?
23. ## Bridge designs - how about floating bridges

Let's see if I can do this: Pictures of the SR 520 floating bridge, I-90 floating bridge, and Hood Canal floating bridge
24. ## Wave energy

I am a firm believer in the idea of using all forms of energy and wave energy is as good as any but this example is really pitiful. Using the wave energy to pump a small volume of water to the top of a cliff and then run it down a pipe to power a dozen electric lights? I have never heard of a nuclear power plant this small, how would you compare the two? You can connect the bouys so they turn a generator rather than pump water and make a lot more power. The losses in the pumping system and the distribution of the water that is pumped and then fall to the turbine are over 50%. You don't use wind turbines to pump water into a reservoir to power a water tubine that makes power - you use the wind to make the electrical power. Paul
25. ## Bridge designs - how about floating bridges

In Seattle we have two concrete floating bridges. They are concrete pontoons that are anchored, at 90 degrees to the span, with 4 anchors per pontoon. The roadway is then laid atop the floating structure. The spans have rotating structures to open a path for large boats and smaller ones can go under the raised portions at each end of the bridges. There is also a third floating bridge in Washington across the sound that is very similar to the others. High winds and waves tend to be problematic but we don't have to deal with ice or iceburgs. The one across the sound has to deal with tidal forces, high winds and big waves - it gets shut down when things get too bad. Paul
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