1109_Physics ProblemsTechnical Physics

1109_Physics ProblemsTechnical Physics - 450 *P39.48...

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450 Relativity *P39.48 Let observer A hold the unprimed reference frame, with u c 1 3 4 = and u c 2 3 4 =− . Let observer B be at rest in the primed frame with ′= = u uv uvc 1 1 1 2 0 1 vu c == 1 3 4 . (a) Then ′= = −− + = + u cc c 2 2 2 2 1 3434 13 4 3 4 15 19 1 6 bg . speed = = u c 2 32 25 16 24 25 0960 .. (b) In the unprimed frame the objects, each of mass m , together have energy γγ mc mc mc mc 22 2 2 2 2 10 7 5 302 += = . In the primed frame the energy is mc mc mc 2 2 2 2 2 9 6 457 + = . . , greater by 151 2 2 . . . mc mc = times greater as measured by observer B . Section 39.9 Mass and Energy P39.49 Let a 0.3-kg flag be run up a flagpole 7 m high. We put into it energy mgh =≈ 03 7 20 . kg 9.8 m s m J 2 ej . So we put into it extra mass m E c × 2 8 2 16 20 31 0 21 0 J ms kg for a fractional increase of 0 10 16 15 × kg 0.3 kg ~. P39.50 E 286 10 5 . J . Also, the mass-energy relation says that
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .

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