You can jump higher in the dark

Light is affected by gravity. Surely that means that light has a mass, however minute. If this is so then it also has a resistance, any particle does if you push against it, again however minute. So from this i conclude that you can run faster and jump higher in the dark. The difference is probably undetectable.

I am quite sure I'm wrong somewhere along the line, but it all makes sense to me.

Light has momentum so when you're standing in the sunshine, you're constantly being bombarded by light which exerts a small pressure on you. This means when you jump, you've got an extra force pushing you down than just gravity. If you did do it in the dark you would jump slightly higher (assuming you could perfectly replicated the jump) but it'd be fractions of a millimetre.

The sun exerts gravitational influence....so you should be able to jump a little higher....although the magma / crust would also swell in its direction producing the opposite affect. Basically get a super sensitive gravitometer and record a few thousand readings from mid-day and midnight and you'll know the answer.

Everything's easy when you're a crank

...fractions of a millimetre, get the scale correct dude (zepto, yoctometre might be more appropriate)

This post has been edited by fivedoughnut on Oct 14 2006, 04:42 AM

cheers dudes

is there any particle with less mass than a light particle

This post has been edited by dyosh on Oct 14 2006, 02:39 PM

Light doesn't have mass. It has momentum, but in a way different than the type that involves mass

To have less mass than light would require negative mass. I know of no such beast.

Light is not affected by gravity because it has mass. It is affected by gravity due to the fact that is travelling through a mass-induced-curved space-time. Or something.

How much is the earth's gravitational pull affected by the moon, which effects tides of course. Would not athletic feats be improved when the moon is overhead? Feats such as running, lifting, jumping etc.

Yeah, absolutely. You'd be best off waiting for a solar eclipse; that way the sun AND the moon are above you.

That said, I'd imagine that the effect would be minor. reallllly minor.

Yes, no doubt. The Sun I think is too far away to have any measurable effect on us personally, though of course we see much greater effect on larger objects. The moon being so much smaller, but much closer, would have the greater exertion I feel.

Actually the tidal force produced by the sun is only 1/2 or so that of the moon. So if the moon does have a greater effect but not that much greater (definatly measurable if the moons force is measurable, and no doubt orders of magnitude higher in effect than weither the light is on your head or not)

Does this mean that a straight line in space-time bends too? Lets say You shine a flash into space - if You are unlucky with the positions of the masses You might illuminate Your own behind. Just wondering!

Light cannot escape a black hole's gravitational field..

Light has to have mass that is why it is classified as having particle and wavelike characteristics (dual wave particle theory). the particles of the light do have a mass. which is also why if light is shined (in a vacume) toward a wheel the wheel will rotate. i forget what this experiment is called or who did it but it is true. and it can bend because of this.

Having momentum is not the same as having rest mass. The photon has momentum but no rest mass.