469_Physics ProblemsTechnical Physics

469_Physics ProblemsTechnical Physics - Chapter 15 (f) T= a...

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Chapter 15 471 (f) T = += + = 204 025 03 98 0024 12 03 3 06 0 497 3 56 .. . . . . . af bg ej b g kg m s ms Nm kg 12 N m s s s 2 π Then f T == 1 0281 . H z . (g) T mg kv m k sk = + 2 µµ increases as m increases, so the frequency decreases . (h) As k increases, T decreases and f increases . (i) As v increases, T decreases and f increases . (j) As increases, T increases and f decreases . *P15.75 (a) Newton’s law of universal gravitation is F GMm r Gm r r =− F H G I K J 22 3 4 3 πρ Thus, FG m r F H G I K J 4 3 Which is of Hooke’s law form with kG m = 4 3 (b) The sack of mail moves without friction according to F H G I K J = 4 3 Gmr ma aG r r F H G I K J 4 3 2 ω Since acceleration is a negative constant times excursion from equilibrium, it executes SHM with = 4 3 G and period T G 23 ρ The time for a one-way trip through the earth is
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