Class Management | Help Chap 17 Begin Date: 4/25/2017 12:00:00 AM --Due Date: 12
ID: 1793510 • Letter: C
Question
Class Management | Help Chap 17 Begin Date: 4/25/2017 12:00:00 AM --Due Date: 12/10 2017 11:59:00 PM End Date: 12/23/2017 12:00:00 AM (2096) Problem 1: You stand at the top of a deep well. To determine the depth (D) of the well you drop a rock from the top of the well and listen for the splash as the water hits the water's surface. The splash arrives t = 4.2 s after you drop the rock. The speed of sound in the well is v339 m/s. tatus for ew Otheexpertta.com tatus 50% Part(a) Find the quadratic equation for the distance, D in terms of the time, the acceleration due to gravity and the speed of sound. Arrange the expression so that the coefficient of the D term is1 Grade Summary Deductions 100% Attempts remaining: 3 (4% per attempt) detailed view Submit Hint I give up! Hints: 4% deduction per hint. Hints remaining Feedback: 5% deduction per feedback. 50% Part (b) Solve the quadratic equation for the depth of the well, D, in meters.Explanation / Answer
time taken is t = 2D/Vs
Vs is the speed of sound
required quadatic expression is
D^2 - 2D(Vs*t+(Vs^2/g)) + t^2Vs^2 = 0
b) solving the above expression
D^2 - 2D((339*4.2)+(339^2/9.8))+(4.2^2*339^2) = 0
D = 77.3 m