Dacetine Member Profile in The AnswerBank

rechargeable batteries vs ordinary

Has anyone figured out weather it is in fact more economical to use rechargeable batteries rather than the normal ones..i.e charging costs and initial outlay??

Space

how efficient is a rechargeable battery ?

I was reading a few articles about hybrid cars and regenerative breaking today...and wondering how much energy is wasted when stored into a battery to be re-used later. In other words: what is the...

buffyuk

uv glow?

Any idea of household substances that glow really bright under uv light. obviously uv pens etc. but any general substances?

blinkyblinky

because time stops passing for something travelling at the speed of light. Presumably over time photons don't lose energy and start slowing down, because photons are light, and the speed of light is...

gerkin

Windforce

For a constant wind speed does wind loading increase for an increase in specific humidity and pressure ?

janesmythe22

Something out of nothing

I'm quite sure that myriad other definitions exist, but it feels that they all make something out of nothing:Point: a place in space with zero dimensions, shape, size, or extension (0D)Line: an...

myron21

How many megatons

After watching a documentary on Hiroshima, I was just wondering what are the destructive capabilities of the largest Nuclear weapons in the world today, i.e whats is the largest area that could be...

justineo

space discovery

I always thought that Teflon was created in the 60s and had something to do with the US space programmes but I've just read that it was invented in the late 30s by Roy Plunkett. Does anybody...

saraho

blowing

why do blow on a match to put the fire out, but blow on a fire to make it burn?

saraho

lemonade

what is the active ingredient in lemonade that makes it fizzy, is it carbonated water or citric acid?

kev100

Speed of light

Albert Einstein told the world way back that no mass can travel at the speed of light which means that space travel is an impossibility, so why does the USA spend billions of dollars on something that...

curragh

space

does anyone know a good website about space thats no bbc or space.com

ll_billym

Vitamins

Does it matter whether you get vitamins from fresh fruit / veg or from pills. I know that it is better to eat healthily than unhealthily but are the actual vitamins themselves and the benefits...

brionyw

Gravity effecting television

Random question but does gravity have any effect on a television image? I think not but a strange friend thinks it does

Xollob

Layla - why is this good?

Is there any scientific explanation why certain combinations of musical notes - for example the opening bars of 'Layla' by Derek and the Dominos - are good/memorable/powerful/timeless/exciting/etc. ?

JOEYSHABADO

Aliens

Are there alien lifeforms out there in our galaxy who are just waiting for us to develop our aggressive instincts with technology that will be a threat to them, so that they can zap us. ps. This is...

JOEYSHABADO

Leave my head alone

I saw a strange thing on tv the other night, where a scientist (he had a beard and glasses, so I assume so) pointed out that in the future much of our 'mental life' will be selectable through direct...