Feeds

Engineer designs glass slipper on Quora

You shall go to the ball, Cinderella

  • alert
  • submit to reddit

Choosing a cloud hosting partner with confidence

This is merely a diversion, but a delightful one nonetheless: a mechanical engineer has answered a question posed on Quora, “What qualities would the glass in Cinderella's slippers need to have in order for her to walk and dance comfortably (and hold her weight)?”

In the kind of what-if that probably has Randall Munroe over at xkcd saying “I wish someone had asked me that”, mechanical engineer Antariksh Bothale gives the perhaps-unsurprising answer that the slipper needs to be made out of something better than ordinary glass – thermal toughened glass should do the trick.

But the pleasure of the post is the journey rather than the destination. From the assumption that Cinderella probably weighed in at around 50 kg – not, therefore, the product of a fast-food diet – he works out a force of 500 N across the whole slipper.

Standing still, Cinderella is safe enough: she develops a compressive stress across the material of 33 KPa, and ordinary glass can handle compression of 50 MPa. However, if she’s walking or dancing, the shoe – particularly its heel – will undergo a twist.

That, Bothale writes, gets a stress of 19 MPa in the heel which (because engineers like to make conservative assumptions) is “dangerously close” to the 50 MPa limit. Hence his decision to favour toughened glass, which can stand more like 200 MPa.

Lovely: even with the killjoy first-comment who points out that “glass” is merely a confusion in translation, and the original slipper was probably fur. ®

Secure remote control for conventional and virtual desktops

More from The Register

next story
Oz carrier Tiger Air takes terror alerts to new heights
Don't doodle, it might cost you your flight
WRISTJOB LOVE BONANZA: justWatch sex app promises blind date hookups
Mankind shuffles into the future, five fingers at a time
Every billionaire needs a PANZER TANK, right? STOP THERE, Paul Allen
Angry Microsoftie hauls auctioneers to court over stalled Pzkw. IV 'deal'
Oi, London thief. We KNOW what you're doing - our PRECRIME system warned us
Aye, shipmate, it be just like that Minority Report
Apple's Mr Havisham: Tim Cook says dead Steve Jobs' office has remained untouched
'I literally think about him every day' says biz baron's old friend
Cops apologise for leaving EXPLOSIVES in suitcase at airport
'Canine training exercise' SNAFU sees woman take home booming baggage
prev story

Whitepapers

Secure remote control for conventional and virtual desktops
Balancing user privacy and privileged access, in accordance with compliance frameworks and legislation. Evaluating any potential remote control choice.
Intelligent flash storage arrays
Tegile Intelligent Storage Arrays with IntelliFlash helps IT boost storage utilization and effciency while delivering unmatched storage savings and performance.
WIN a very cool portable ZX Spectrum
Win a one-off portable Spectrum built by legendary hardware hacker Ben Heck
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?
Beginner's guide to SSL certificates
De-mystify the technology involved and give you the information you need to make the best decision when considering your online security options.