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ur inst urse Sunda Secure I https//session masteringphysics.com/myct/ite University Physics at FDU UPS17 M21 Problem 12.11 Problem 12.11 The three 190 g masses in the figure (Eigure 1)are connected by massless, rigid rods. Figure 1 v of 1 40 cm 40 cm Axis 60 60% 40 cm 517-MP1 signed in as brianna thomas Hele Close Resources previous l 1 of 7 l next Part A What is the triangle's moment of inertia about the axis through the center? Express your answer to two significant figures and include the appropriate units. I s 0.0304 kgm Submit My Answers Give Up Incorrect: Try Again; 8 attempts remaining Part B

Explanation / Answer

distance between each mass placed at vertex and centre = 20/ cos 30 cm = 40 / sqroot (3) cm

I ( moment of inertia ) = 3 ( mr^2) = 3 ( 190 x 10^-3) ( 40^2 /3 )x 10^-4 = 0.0304 kg m^3 whoch should become 0.03 kg m^2 when expressed in 2 significant figures.

KE = 1/2 I w^ 2= 0.5 ( 0.0304) ( 26.389 rad/s)^2 = 10.585 J apprx

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