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 Dec 15 revised How does electromotive force (emf) influence electrostatic force in a circuit? fixed grammar and heading Dec 15 suggested approved edit on How does electromotive force (emf) influence electrostatic force in a circuit? Dec 15 answered How far can light go? Dec 15 comment The Center of Mass for proton-proton collisions at the LHC Thanks, that was exactly the answer I was looking for. Dec 15 accepted The Center of Mass for proton-proton collisions at the LHC Dec 15 comment The Center of Mass for proton-proton collisions at the LHC @ACuriousMind different to a fixed target machine for one. Also, that proof does not lead to $4E_p^2$ can you elaborate on what you're talking about? Dec 15 asked The Center of Mass for proton-proton collisions at the LHC Dec 8 revised Why do some objects tend to change their axis of rotation while rotating? got rid of needless info Dec 6 comment Does $R=\dfrac{4q^2}{\pi^2a^2gH^2}$ suggest a square root relationship? Best answer, in my view. Dec 2 comment Ball on a slope How the hell is this off topic? Dec 2 comment Rotational mechanics - ball climbing a step @Gummybears do you know about cross products? Dec 1 awarded Notable Question Nov 30 comment How is charge expressed? @annav your answer may also answer this question but that does not make the questions themselves the same. This question is very specific and imho it is not asking the same thing that the question you linked to was asking. Nov 30 revised How is charge expressed? formatting for readability. Nov 30 comment Rotational mechanics - ball climbing a step Do you understand what the question asks for when it asks for the "least horizontal force"? This is quite important to solving this problem. Once you know that you can just equate the lhs of torque with the rhs and rearrange to get your solution. Nov 30 comment How is charge expressed? @annav this is a very specific question about the frequency of the emitted photon. Nov 30 suggested approved edit on How is charge expressed? Nov 30 answered Rotational mechanics - ball climbing a step Nov 30 comment Rotational mechanics - ball climbing a step You need an angle so you want to equate it to a torque expression with an angle. Nov 30 revised Rotational mechanics - ball climbing a step texify the work and format it a bit.