209_Physics ProblemsTechnical Physics

209_Physics ProblemsTechnical Physics - Chapter 7 P7.62 (a)...

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Chapter 7 211 P7.62 (a) FL Nm mNm m 2.00 4.00 6.00 8.00 10.0 12.0 15.0 32.0 49.0 64.0 79.0 98.0 14.0 16.0 18.0 20.0 22.0 112 126 149 175 190 a f a f a f a f FIG. P7.62 (b) A straight line fits the first eight points, together with the origin. By least-square fitting, its slope is 0 125 2% 125 2% . N m m N m ±= ± In Fk x = , the spring constant is k F x = , the same as the slope of the F -versus- x graph. (c) x == = 125 0 105 13 1 m N bg a f .. P7.63 KWW K mv kx kx mg x mv kx mgx mv isgf ii f f ii f ++ = +−+ = +− + ° = 1 2 1 2 1 2 1 2 0 1 2 01 0 0 1 2 222 2 22 cos cos θ FIG. P7.63 1 2 1 20 5 00 0 050 0 0 100 9 80 0 050 0 10 0 1 2 0100 0150 851 10 00500 0141 168 2 32 . . . . s i n . . . . . . N cm cm m kg m s m kg J J k g ms 2 af b g ej b g −° = −× = v v v P7.64 (a) ∆∆ EK m v v fi int =− 1 2 : E int kg m s J = 1 2 0400 600 800 560 2 . . a f a f (b)
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