VI Wiley PLUS Three of the following X My grandfather (drivi x Physics question

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VI Wiley PLUS Three of the following X My grandfather (drivi x Physics question I Ch X C Secure https:// dug wiley plus.com/edugen/student/ma run I MLSSAGL MY INSIRUCIOR FULL scRLLN PRINILR VLRSION BACK NEXT ASSIGNMENT Z Ye our answer Is partially correct. Try agaln RESOURCES Chapter 9 A helicopter has two blades (see figure), each of which has a mass of 290 kg and can be approximated as a thin rod of length 6.7 m. The blades are rotating at an Homework Problems angular speed of 49 rad/s. a) What Is the total moment of Inertia of the two blades about the axls of rotatlon (a) Determlne the rotatlonal klnetlc energy of the Chapter 09, Prohlem Dinning blades Chapter 09, Prohlem Chapter 00 Problem Chapter Problem (a) Numb 18678.7 Units kg m 2 v (b) Number 212611 Un Chapter U9, Hrablem Click if you would like to show work for this question Open Show Work er 09 Proble Chapter 09, Problem 50 SIIOW Version 1.22.3.5 License Agreement Privacy I 2QRO 2QuZehn Miley Sons Inc. All Rights Reserved. A Division of lohn Wiley Sons Inc. 37 PM ype here to search Desktop 5/7/2017

Explanation / Answer

a)The moment of inetria of the blades will be:

I = 2/3 m r^2

I = 2 x 290 x 6.7^2/3 = 8678.73 kg-m^2

Hence, I = 8678.73 kg-m^2

b)We know that rotaional KE is given by

KE(rot) = 1/2 I w^2

KE(rot) = 0.5 x 8678.73 x 49^2 = 10418815.365 J

Hence, KE(rot) = 10418815.365 J = 1.042 x 10^7 J

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