Saturday, 9 April 2011

Cotton Reel or 'Bobbin' Tank.


Wartime Housewife said...

That is completely brilliant. Whoever does it work?

Outa_Spaceman Being: 53 said...

Knicker elastic.

Wartime Housewife said...

Ah - knicker elastic. What a shame that knickers don't have it any more.

Dogsbody, Scrivener and Wretch said...

Now, I desperately need to know the answer to the following A-level applied mechanical physics exercise:

Assume the diameter of the bobbin reel (D), and the coefficient of friction (Cf) between it and the surface on which it is placed, are constant.
Devise an equation that will determine the maximum speed (Vmax)that such a vehicle will achieve.
Your variables will include:
The length of the pencil (l).
The absolute temperature (t) of the wax-candle lubricant.
The number of turns on the nicker elastic (n).
It is also assumed that the elastic limit of said nickers has not been exceded.

Additional marks will be accorded to students who can accurately incorporate other (defined) variables into the final equation.

Please help.
The exam is tomorrow!