02_InstSolManual_PDF_Part22

# 02_InstSolManual_PDF_Part22 - and The time for the sound of...

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2.87. Set Up: Let be the time for the rock to fall to the ground and let be the time it takes the sound to travel from the impact point back to you. Both the rock and sound travel a distance d that is equal to the height of the cliff. Take downward for the motion of the rock. The rock has and Solve: (a) For the rock, gives For the sound, Let and (b) You would have calculated You would have overestimated the height of the cliff. It actually takes the rock less time than 10.0 s to fall to the ground. Reflect: Once we know d we can calculate that
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Unformatted text preview: and The time for the sound of impact to travel back to you is 12% of the total time and cannot be neglected. The rock has speed just before it strikes the ground. 86 m / s t s 5 1.2 s. t fall 5 8.8 s d 5 1 2 1 9.80 m / s 2 21 10.0 s 2 2 5 490 m. d 5 384 m. a 5 19.6 0.00303 a 2 1 0.4518 a 2 10.0 5 0. a 2 5 d . t s 5 d 330 m / s 5 10.0 s. t fall 5 Å 2 d 9.80 m / s 2 . y 2 y 5 v y t 1 1 2 a y t 2 a y 5 9.80 m / s 2 . v y 5 1 y t fall 1 t s 5 10.0 s. t s t fall 2-22 Chapter 2...
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## This note was uploaded on 03/06/2009 for the course PHYS 114 taught by Professor Shoberg during the Spring '07 term at Pittsburg State Uiversity.

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