Class Management Help elasticity Begin Date: 9/23/2017 11:00:00 AM -- Due Date:
ID: 1779979 • Letter: C
Question
Class Management Help elasticity Begin Date: 9/23/2017 11:00:00 AM -- Due Date: 10/3/2017 11:59:00 PM End Date: 10/17/2017 11:59:00 PM (33%) Problem 3: Suppose a piano tuner stretches a steel piano wire 9.5 mm. The wire was originally 0.975 mm in diameter, 1.33 m long, and has a Young's modulus of 2.10x1011 N/m2 Randomized Variables lo=1.33 m 9.5 mm d=0975 mm > Calculate the force a piano tuner applies to stretch the steel piano wire in Newtons Grade Summary Deduction:s Potential Late work % 75% Late Potential 75% 0% 400% | | 789 tan() cotanOasin acos0 acotan) sinhO) sinO cosO Submissions Attempts remai ning: 7 cosh)tanh) cotanh) % per attempt) detailed view END Degrees Radians DEL CLEAR Submit Hint I give up! Hints: 0% deduction per hint. Hints remaining: 4 Feedback: 1% deduction per feedbackExplanation / Answer
Y= stress /strain = (F/A)/(dL/L)
A = pi*r^2 = (3.14*0.975^2/4) = 0.74662 mm^2
2.1*10^11 =F*1.33/(9.5*10^-3*0.74662*10^-6)
F=1120 N