Q: A rock is dropped from rest into a well. a) The sound ofthe splash is heard 2
ID: 1759643 • Letter: Q
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Q: A rock is dropped from rest into a well. a) The sound ofthe splash is heard 2.40 s after the rock is released from rest.How far below the top of the well is the surface of the water? Thespeed of sound in air is 336 m/s. b) What if? If the travel timefor sound is ignored, what percentage error in introduced when thedepth of the well is calculated? My question is: If we are finding the initial height(x),than why is it stated as zero in the first equation? ( I wouldthink that the final height (x) would be zero). Also in thefirst setup, the acceleration due to gravity (g) is stated as 9.8m/s. Why isn't it -9.8m/s? My second question: I was wondering how the secondequation to find (t) was derived or what equation we used to obtainthe equation to find (t)? My last question: Why do we have to use the second (t)to find the height and not the first (t)? Thank you Q: A rock is dropped from rest into a well. a) The sound ofthe splash is heard 2.40 s after the rock is released from rest.How far below the top of the well is the surface of the water? Thespeed of sound in air is 336 m/s. b) What if? If the travel timefor sound is ignored, what percentage error in introduced when thedepth of the well is calculated? My question is: If we are finding the initial height(x),than why is it stated as zero in the first equation? ( I wouldthink that the final height (x) would be zero). Also in thefirst setup, the acceleration due to gravity (g) is stated as 9.8m/s. Why isn't it -9.8m/s? My second question: I was wondering how the secondequation to find (t) was derived or what equation we used to obtainthe equation to find (t)? My last question: Why do we have to use the second (t)to find the height and not the first (t)? Thank youExplanation / Answer
from the first eq intial velocity of stone iszero so putting vi = 0 h = 1/2gt2 here g value take as positive in down ward direction so stone fall in well means down ward direction sog = +9.8m/s2 time = distance/ velocity but here stone travelled distance is equal to h so t = h/v time = distance/ velocity but here stone travelled distance is equal to h so t = h/v here we take desending order time h = vt second time is both assending and desending order timeit is total time.Related Questions
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