Suppose we know a particle’s four-momentum pt and px components. If we draw the particle’s four-momentum arrow on an energy–momentum diagram, we can use a hyperbola to determine

A. The particle’s energy.

B. The particle’s speed.

C. The particle’s x-velocity.

D. The particle’s momentum magnitude .

E. The particle’s mass.

F. The scaling on the t axis.

T. Something else (specify).


E. The particle’s mass.

Physics & Space Science

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Ball A is thrown up and Ball B is thrown down, both with the same initial speed. Neglecting air resistance, just prior to hitting the ground, which of the following is true?

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In an elastic collision, one ball has initial velocity v and strikes another, much less massive ball, that is initially at rest in a head-on collision. The velocity of the second ball after the collision is equal to:

A. v B. 2v C. v/2 D. -v E. something else

Physics & Space Science