Posts by James Butler

  • Hard News: Never mind the quality ..., in reply to James George,

    fuckin racist as all get up

    I'm wondering what her clients think of all this. Because, you know, if it causes them to lose face...</sarc>

    Auckland • Since Jan 2009 • 801 posts Report Reply

  • Hard News: The silence of the public square, in reply to Lucy Telfar Barnard,

    twock

    What's the sign for "twock"? Inquiring minds want to know.

    Auckland • Since Jan 2009 • 801 posts Report Reply

  • Hard News: Auckland's future: Keep calm,…,

    CONGESTION PRICING

    Auckland • Since Jan 2009 • 801 posts Report Reply

  • Hard News: Going solar?, in reply to Russell Brown,

    Would it make any sense to wait for PV? Would that be a better long-term investment than buying into solar water-heating now?

    I heard once that it's becoming cheaper to install PV and use regular electric hot water than it is to use direct thermal solar hot water, just because plumbing is more expensive than wiring. Depends on your use-case though. If you want maximum utilization of your roof area, then mixing PV and direct thermal will give you more bang because direct thermal is more efficient.

    Mind you I've never run the numbers because I rent, which makes the whole thing a bit academic |:

    Auckland • Since Jan 2009 • 801 posts Report Reply

  • Hard News: Good news for self-powered travellers, in reply to Kevin McCready,

    Also:

    As a responsible person, when I take younger people riding I insist they were helmets (as it appears does the lecturer in your vid), so why shouldn’t we do the same as a society?

    Because adults are not children.

    Auckland • Since Jan 2009 • 801 posts Report Reply

  • Hard News: Good news for self-powered travellers, in reply to Kevin McCready,

    Yes I know the arguments that if x number of people cycle there will be y reduction in fat and heart attacks.

    I think the more salient argument is that if x number more people cycle, then there will be y reduction in the sum total of road accident injuries. I've never seen any other proposed explanation for the greater safety of cycling in countries where cycling is common.

    Auckland • Since Jan 2009 • 801 posts Report Reply

  • Feed: A scientist researches restaurants,

    Cazador has been revamped, so should we finally actually try it?

    I tried the revamped Cazador the other night, and I quite liked it overall. However the main dishes on our set menu all seemed to be variations on "here's a pile of game meat roasted rare and sliced thinly" which is nice, but I don't think does enough to show off the differences between the meats. The hare just tasted like... meat.

    Auckland • Since Jan 2009 • 801 posts Report Reply

  • Speaker: Sponsored post: Speed and Safety, in reply to Brent Jackson,

    Quite true.

    Auckland • Since Jan 2009 • 801 posts Report Reply

  • Speaker: Sponsored post: Speed and Safety,

    In the relativistic case, the entire mass of the car would be instantly converted to energy at the rate of mc^2, which for a 1.5 tonne car would be an explosion equivalent to several gigatons of TNT. That would be one incentive to drive safely.

    Auckland • Since Jan 2009 • 801 posts Report Reply

  • Speaker: Sponsored post: Speed and Safety, in reply to Matthew Poole,

    Not four times as bad? Or some other even higher number? I’d have thought driving/crashing at 100km/h was much more dangerous than driving/crashing at 50km/h.

    In terms of released energy, yes, it’s four times as bad thanks to the “squared” in the theory of relativity.

    *cough* Not quite - it's all Newtonian. A car's kinetic energy is 1/2(mv^2). So one car hitting a perfectly strong wall at 100km/h will release four times the energy of the same car hitting the same wall at 50 km/h; but two identical cars hitting each other head on at identical speeds will only release twice as much as one hitting a wall at the same speed.

    Think of it this way - in both the car-hits-wall case and the car-hits-car case, each car decelerates from v to zero during the collision, so the total energy is e * (number of cars).

    (Russell - how about LaTeX parsing for comments?)

    Auckland • Since Jan 2009 • 801 posts Report Reply

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