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Window Help llum.ecollege.com/ 1 4 794825&OpenVelumHMAC-425; 59e9f558 96774Occde 76da82 39659# 1 0301 Summer 2018 PHYS191 30354 L51 ssignments CHW-Cho2 Item 9 constants ? Part A You are climbing in the High Sierra where you suddenly find yourself at the edge of a fog- shrouded cliff. To find the height of this cliff, you drop a rock from the top and 8.20 s later hear the sound of it hitting the ground at the foot of the cliff gnoring air resistance, how high is the ciff if the speed of sound is 330 m Express your answer with the appropriate units h329.5 Submit Prevlous Answers Request Answer X Incorrect; One attempt remaining: Try Again Part B Suppose you had ignored the time it takes the sound to reach you. In that ca overestimated or underestimated the height of the citt? ? F3

Explanation / Answer

here,

the speed of sound , vs = 330 m/s

time travelled by rock , t = 8.02 - h/vs

t = 8.02 - h/330

and

h = u * t + 0.5 * g * t^2

h = 0 + 0.5 * 9.81 * (8.02 - h/330 )^2

solving for h

h = 257.2 m

the height of cliff is 257.2 m

b)

when the time taken by sound is ignored

let the time taken be t

h = u * t + 0.5 * g * t^2

h = 0 + 0.5 * 9.81 * 8.02^2

solving for h

h = 315.5 m

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