02_InstSolManual_PDF_Part22

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

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

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 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...
View Full Document

Ask a homework question - tutors are online