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## Main Question or Discussion Point

You hold in the palm of your hand a classical particle with momentum

[tex]P = (E,cp_{x},cp_{y}, cp_{up})[/tex] where [tex]cp_{up}=0[/tex] .

Placing it gently on a scale you ask, what part of

[tex]P = (E,cp_{x},cp_{y}, cp_{up})[/tex]

is pushing down on the scale?

[tex]P = (E,cp_{x},cp_{y}, cp_{up})[/tex] where [tex]cp_{up}=0[/tex] .

Placing it gently on a scale you ask, what part of

[tex]P = (E,cp_{x},cp_{y}, cp_{up})[/tex]

is pushing down on the scale?