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= Q C+3 Thu 8:06 PM 9 O = Ý Chrome File Edit View History Bookmarks People Window Help MasteringPhysics: Chapter 10 HW A Secure https://session.masteringphysics.com/myct/itemViewassignmentproblemlD-87761713 Chapter 10 HW) Problem 10.52 Problem 10.52 The engine of a model airplane must both spin a propeller and push air backward to propel the airplane forward. Model the propeller as three 0.20-m-long thin rods of mass 0.025 kg each, with the rotation axis at one end, Part A What is the moment of inertia of the propeller? Express your answer to two significant figures and include appropriate units. HMÅ 6 + O 9 ? Value Units Submit My Answers Give Up Part B How much energy is required to rotate the propeller at 5700 rpin? Ignore the energy required to push the air. Express your answer to two significant figures and include appropriate units. TA LA 6 - 0 = ? Value Units Submit My Answers Give Up Provide Feedback Continue

Explanation / Answer

(A) I of single rod = m L^2 / 3

I =3 ( m L^2 / 3) = m L^2

I = 0.025 x 0.20^2 = 1 x 10^-3 kg m^2

(B) w = 5700 x 2pi rad / 60 s = 596.9 rad/s

KE = I w^2 /2

= 178 J

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