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Now I get it. thanks you guys

Hi Chronos Thanks for answering What do you mean ? What's meant by a higher order derivative ?

Oh, it suppose to determine why the gravity of the moon is 1/6 of the earth's

Chroot, thank you so much for answering - I really appreciate it could you tell me what's wrong with this calculus ? It's troubling me a lot Thnak you - I'm kind of getting desperate :(

Please does anyone have an answer for me. I just read this in another forum,but I don't know if its correct or not.

Is this calculus correct, or do the decimals points have to be converted ? Thanks so much , cause I'm stuck The gravitational constant is 6.673 * 10 to the -11th power. The radius of the moon is 1737400 meters. Its mass (which is independent of gravity) is 7.35 * 10 to the 22nd power kg...

UNLESS, the entire light theory as we know it is reversed. What IF photons are constantly in the air, but connect to an electron the moment it is energized - it connects to it at the speed of light ...when it becomes visible, or not, depending on frequency.

Would the rest mass of photons actually be non zero, then the theory of quantum electro-dynamics would have to be re-written :confused:

CBR All in all your question is actually a brilliant question. Physicists argue if photons are EM or just a wave duality of a particle without mass. There is no consclusive answer as of today.

Since a photon is generated by an electron, they're both right.

CbR Depending on the frequency and interaction with different electromagnetic waves, photons "can knock you out cold "