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Please does anyone know the risks associated with Laser marking/engraving machines? What are the safety regulations for them? I believe this is a Class 4 laser as it has the warning sticker about...
Posted this question once before but answer was inconclusive. It still provokes fierce arguments amongst my friends.The question is........Does the outer end of a second hand on a clock move faster...
On a standard calulator keypad, if you take any block of 4 keys and key then in, either clockwise or anticlockwise, starting with any key, the answer is always divisible by 11. E.g. 4785 or 2563. This...
My Chemistry teacher frequently calls biology applied chemistry, and physics applied maths, and he always says chemistry is the most important science. Recently a Physics teacher (not mine he teaches...
a quantity q is calculated by the formula q = ab-c . a is known with uncertainty +/-x%, b has uncertainty +/-y% and c has uncertainty +/-z%. ab = 2c what is the uncertainty of q?
does the rays of the sun bounce back off a mirror of foil type material to brown or tan the skin? ive heard of people on hols do this wen sunbathing...please give loadsa info...thanks
ok- we all sleep, we know it rests our body or it rests our minds or it does something....... but in scientific or medical terms what actually is happenig within our bodies- what actions are taking...
How can I solve (x-2)(x^2+3x+1)=0 From the question: a) Show that (x-2) is a factor of f(x)=x^3 + x^2 -5x -2. b) Hence find the exact solutions of the equation f(x) = 0 I've managed to get to the last...