Feeds

Engineer designs glass slipper on Quora

You shall go to the ball, Cinderella

  • alert
  • submit to reddit

High performance access to file storage

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. ®

High performance access to file storage

More from The Register

next story
Forget the beach 'n' boardwalk, check out the Santa Cruz STEVE JOBS FOUNTAIN
Reg reader snaps shot of touching tribute to Apple icon
Oz bank in comedy Heartbleed blog FAIL
Bank: 'We are now safely patched.' Customers: 'You were using OpenSSL?'
Happy 40th Playmobil: Reg looks back at small, rude world of our favourite tiny toys
Little men straddle LOHAN, attend tiny G20 Summit... ah, sweet memories...
Lego is the TOOL OF SATAN, thunders Polish priest
New minifigs like Monster Fighters are turning kids to the dark side
Dark SITH LORD 'Darth Vader' joins battle to rule, er, Ukraine
Only I can 'make an empire out of a republic' intones presidential candidate
Chinese company counters pollution by importing fresh air
Citizens line up for bags of that sweet, sweet mountain air
Google asks April Fools: Want a job? Be our 'Pokemon Master'
Mountain View is prankin' like it's 1999...
prev story

Whitepapers

Securing web applications made simple and scalable
In this whitepaper learn how automated security testing can provide a simple and scalable way to protect your web applications.
Five 3D headsets to be won!
We were so impressed by the Durovis Dive headset we’ve asked the company to give some away to Reg readers.
HP ArcSight ESM solution helps Finansbank
Based on their experience using HP ArcSight Enterprise Security Manager for IT security operations, Finansbank moved to HP ArcSight ESM for fraud management.
The benefits of software based PBX
Why you should break free from your proprietary PBX and how to leverage your existing server hardware.
Mobile application security study
Download this report to see the alarming realities regarding the sheer number of applications vulnerable to attack, as well as the most common and easily addressable vulnerability errors.