Why is it impossible to fold a paper 9 times?

Because paper doesn't stretch. 1 doubled 9 times equals 512. So, once folded 9 times (if you can manage it), the piece of paper becomes 512 sheets thick, and the size of each 'page' in that stack is reduced to one 512th of the size of the sheet you started with.

theguardian.com - Why is it impossible to fold a piece of paper in half more than 9 times?

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SPECULATIVE SCIENCE

Why is it impossible to fold a piece of paper in half more than 9 times? Natty, Manchester Because paper doesn't stretch. 1 doubled 9 times equals 512. So, once folded 9 times (if you can manage it), the piece of paper becomes 512 sheets thick, and the size of each 'page' in that stack is reduced to one 512th of the size of the sheet you started with. Once the wad starts to get thick, the outer layer has to stretch around the outside of the fold, and this can't be sustained as the "pages" get smaller and the radius of the outside of the bend gets bigger. Tim Waterfield, Montreal, Canada If the sheet of paper were only one tenth of a millimetre thick, after nine (perfect - i.e. ignoring extra depth given by the fold itself) foldings you would have a wad of paper over 5cm thick. It might be possible to fold this once or twice again, but certainly no more, no matter how large a sheet you began with. Russell Turner, Norwich I once saw this question being dealt with on a popular science TV program. The presenters demonstrated the problem (with both a normal piece of paper, and then a piece which was 20 feet square), explained the reason, and then repeated the experiment with aluminium foil (which was, of course, thinner than the paper). They managed, if I remember correctly, something like 14 folds with the foil. Jeremy Bechelet, Telford The same applies to tearing a piece of paper down its centre, putting the resulting halves together and then tearing them in half again. This can only be done eight times in my experience however this is more to do with the thickness of the paper after eight tears than its stretching properties. Dan Twynam, Birchington, Kent

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Does GWM use Toyota engines?

autotrader.co.za - how reliable and durable is the gwm steed 5 - AutoTrader

Jul 14, 2018 - 10:36 PM

Hi there

The GWM Steed is a mixture between older-generation mechanical bits based on Toyota, Isuzu or Mitsubishi, installed in an older-generation Isuzu chassis, and using a modified old-Isuzu body on top of it. - The 2.2 petrol uses a derivative of the old Toyota 3Y engine (as used in the Hilux up till the end of the 1990s), but with Denso fuel injection instead of a carburettor. It's proven to be a very robust engine. - The 2.4 petrol uses an "out-of-the-box" Mitsubishi 4G69 engine, which is also proven to be very durable. - The 2.5 Diesel uses an old direct-injection Isuzu diesel, with the addition of a turbo and Bosch common-rail injection. Again, all well-known and proven systems. GWM has a well-stocked parts warehouse - in fact, you can buy all the components necessary to build a complete bakkie with off-the-shelf parts - so aftermarket support won't be much of an issue. Of course, if you get a 2.2 petrol, you can actually use aftermarket parts suitable for the 3Y or 4Y engines, so that won't be a problem, and body- and chassis parts are very similar to Isuzu items, so that shouldn't prove too much of a hassle either. As for durabilty: the mechanical bits are well-proven, so it should run for a long time. However, the loadbay seems to be made from thinner metal, so it will show wear and dents earlier than you'd expect. There's a simple solution to this as well: simply invest in a bakkie liner to protect the load bay. In short, the GWM bakkie range is generally robust, and with reasonable care, will last you a long time.

Hope this helps!

The AskAutoTrader Team

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