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From: Matthew Austern (austern_at_[hidden])
Date: 2001-09-05 11:49:44

Anatoli Tubman wrote:
> I'm no physicist either, but isn't energy a scalar and moment-of-force/torque
> a vector? Those shouldn't really be mixed up!

Depends. In some contexts (basically, if you're doing nonrelativistic
physics) it's reasonable to treat energy as a scalar. In other contexts
it's appropriate to treat energy as one component of the energy-momentum
vector. So the two have the same status: the t component of the energy-
momentum vector has the same dimensions as the x component of the torque

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