Learning Goal: To learn to calculateenergy and momentum for relativistic particl

Question

Learning Goal: To learn to calculateenergy and momentum for relativistic particles and to findrelations among a particle's energy, momentum, and mass.

The first postulate of relativity states that all laws ofphysics are the same in every inertial frame of reference.Consequently, fundamental laws such as the conservation of momentumand the conservation of energy must also be valid in every inertialframe of reference. This required the introduction of newdefinitions of momentum and energy.

and

C) What would the energy of the meteorite be if it were atrest?

(chrisjericho's answers were not correct)

Explanation / Answer

Let   = 1 / (1 - .72) =1.40 m c2 = 1.5 * 10E3 * 9 * 10E16 = 1.35 * 10E20 a) P = m v = 1500 * 2.1 * 10E8 * 1.4 = 4.4 *10E11 kg m / s b) E = m c2 = 1.4 * 1.35 * 10E20 = 1.89 *10E20 J c) at rest E = m c2 = 1.35 * 10E20 d) Ek = E - m c2 = (1.89 - 1.35) *10E20 = 5.4 * 10E19 J I like the presentation as it doesn't use the termrelativistic mass - mass is mass (Einstein didn't either)

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