Recent content by Matthew Travers

Is antimatter time-reversed negative matter? If so, then it would behave like ordinary matter electromagnetically BUT Newton's grav would yield like mass charges attract and unlike masses repel. Ie, a combination of antimatter and matter does not make a diametric drive due to the time inversion...

Thanks Ray and Ehild for your indulgence and patience. Merry Christmas and a happy new year to you and all the staff at physics forum. It's a pleasure becoming that little less ignorant.

One last question please? When I applied the product rule above, I ended up with a a(dm/dt) term. Does this have a physical meaning?

Thanks mate. I had missed that...so energy rises parabolically, power rises linearly, and change in power is a constant when force and acceleration are constant.

First of all, thank you for the feedback I appreciate the distinction for the first equation and pointing it out for me. I must be a bit thick. To me it seems that if acceleration is constant, then energy is being delivered at a constant rate, ie power stays constant and therefore rate of power...

Homework Statement Saw a calculation that put differentiation of power in terms of acceleration as follows: E=Fs dE/dt=Fv=P dP/dt=Fa=ma^2 It doesn't make sense to me because if power was changing, acceleration must change. Correct me if I'm wrong, but shouldn't the product rule be applied...

What I found was perhaps not electrostatic discharge. Apparently graphene demonstrates negative resistance or negative differential resistance where an increase of current through the material counter intuitively leads to a drop in voltage. Researchers intographene transistors are seeking to...

Thanks mate. I don't knowwhether to be relieved or alarmed about that though:nb)

Hang on, just caught up to you...earth everything to discharge and then measure after disconnecting earth. Will try that and a couple of other ideas like putting foil on the other side of the polyethylene and connecting that to the sample so it acts like a shorted cap. Cheers mate

Thanks for that. So if I connected the sample to Earth first, that would eliminate the faulty reading?

Hi I've made what I think is graphene. I first put the solution on cardboard and then I put some on polyethylene. When they had dried, I tested conductivity with a digital multimeter with the scale set on megaohms. The cardboard was nonconducting, but the sample on poly to my astonishment showed...

Hi folks Amateur experimenter here with only rudimentary maths skills. I have the most unfortunate and embarrassing tendency of being most confident in a topic when I am only just starting to learn something about it. I am grateful for being able to participate in a forum where more...