Cows in the Maze by Ian Stewart;

Author:Ian Stewart; [Stewart;, Ian]
Language: eng
Format: epub
ISBN: 9780199562077
Publisher: OxfordUP
Published: 2010-09-15T05:00:00+00:00

FIG 42 The classic ‘teardrop’ shape. But is it?

‘But when a drip falls off a tap, you get a kind of growing bulge of water hanging down, and then part of it sort of pulls off. So you get a sharp tail formed just before the drip detaches.’

‘Draw that too.’ She did (Figure 43).

‘Hmmm. You reckon the drop keeps its sharp tail as it falls.’

‘Yes.’

‘But the water hanging from the tap rounds off?’

‘Yes. Surface tension.’

‘So why doesn’t surface tension round off the falling drop’s tail too?’

‘It gets dragged out behind because the drop’s moving.’

‘Sure?’

Deirdre paused, lips pursed in thought, then shook her head. ‘No, it doesn’t make sense. The tail would round off as well. Falling teardrops must be roughly spherical. Maybe flattened a bit by air-resistance.’

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