564_Physics ProblemsTechnical Physics

564_Physics ProblemsTechnical Physics - 566 *P19.59...

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566 Temperature *P19.59 The effective coefficient is defined by ∆∆ LL T total effective total = α where L total Cu Pb =+ and L x L x L total Cu Pb total total =+= + 1 af . Then by substitution ααα αα Cu Cu Pb Pb eff Cu Pb Cu Pb eff Cu Pb eff Pb 1C LT L L T xx x x += + +− = −= = ×° == −− bg 1 20 10 29 10 17 10 29 10 9 12 0750 66 . *P19.60 (a) No torque acts on the disk so its angular momentum is constant. Its moment of inertia decreases as it contracts so its angular speed must increase . (b) I I MR MR M R R T MR T ii f f i i i i f i f ωω ω αω = = + = 1 2 1 2 1 2 1 2 1 22 2 2 2 fi T =− = −× °° 1 25 0 11 71 0 8 3 0 25 0 0972 25 7 2 6 2 .. . . rad s C rad s rad s ej P19.61 After expansion, the length of one of the spans is T = + ° = 1 125 1 12 10 200 12503 61 a f mC C m . L f , y , and the original 125 m length of this span form a right triangle with y as the altitude. Using the Pythagorean theorem gives: 125 03 125 2 2 2 . m m a f a f y yielding y = 274 m . P19.62 After expansion, the length of one of the spans is T f 1
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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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