Dual Definition and 354 Threads

What do they mean w.r.t Cell Phones ?

Would it be possible for binary planets, or even a planet and it's moon, to simultaneously sustain life? I know the odds of a planet having life on it is very low, but for a planet that does (earth) would it's sister planet or moon be able to sustain life as well? Maybe if the bodies are the...

Hi everyone... I've been struggling with a physics problem for 2 days now... I'm really not sure what to do. Problem - A pair of 10.0 kg masses are suspended from (massless) strings wrapped around a dual pulley. The radius of the smaller shaft on the pulley is half the radius of the...

Can someone give me the formulas for single a two slit defraction of light. And please explain what te variables mean. Are these right? Wave length = xd/L Wave length = yw/L If these are right can someone please explain what the variable stand for because...