Is this a wind-up?
Virtually all the energy (presume you're talking about the engine output, and not the pilot's feet on the brakes!) is thrust, chucking cubic metres of air backwards. The plane can't react in a forward direction 'cos the brakes are on.
Some energy will be absorbed in a vibrating airframe and passengers' teeth!
Hope that's OK.
PS - your profile says you're a pilot?????
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If you're not on the edge, then you're taking up too much space.
[This message has been edited by DreamCatcher (edited 09 March 2001).]