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ackboard.com/webapps/assessment/take/launchjsp?course assessment id 229980 1&course; id- 53725 1&content; id- 2741710 18step-nu QUESTION 1 2 point A helicopter has two blades, each of which has a mass of 235 kg and can be approximated as a thin rod of length 7.1 m. The blades are rotating at an angular speed of 47 rad/s. (a) What is the total moment of inertia of the two blades about the axis of rotation? (b) Determine the total rotational kinetic energy of the two spinning blades QUESTION 2 2 p A solid disk rotates in the horizontal nlane at an angular velocity of 0.067 rad/s with respect to an

Explanation / Answer

Given

m = 235 kg

R = 7.1 m

= 47 rad/s

(a) I = 2mR²/3 = 2(235)(7.1)² / 3 = 7897.6 kg m²

(b) T = ½I² = (0.5)( 7897.6)(47)² = 8722899.2 J

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