A 68 k g man\'s arm, including the hand, can be modeled as a 75- c m -long unifo

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A 68 kg man's arm, including the hand, can be modeled as a 75- cm -long uniform cylinder with a mass of 3.5 kg . A 68 kg man's arm, including the hand, can be modeled as a 75- cm -long uniform cylinder with a mass of 3.5 kg . A 68 kg man's arm, including the hand, can be modeled as a 75- cm -long uniform cylinder with a mass of 3.5 kg . A 68 kg man's arm, including the hand, can be modeled as a 75- cm -long uniform cylinder with a mass of 3.5 kg . o AT&T; LTE 7:16 PM 21%) O session.masteringphysics.com C Problem 7.61 MasteringPhysics Problem 7.61 A 68 kg man's arm, including the hand, can be modeled as a 75-cm-long uniform cylinder with a mass of 3.5 kg Part A In raising both his arms, from hanging down to straight up, by how much does he raise his center of gravity? Express your answer to two significant figures and include the appropriate units. h= | Value Units 1 2 3 456 78 9 Submit Give Up

Explanation / Answer

GIVEN: masses=68kg, 3.5kg

Let "M" be the total mass and "2m" be the mass of the two arms.
Then initially the CM is;
Xi = [(M-2m)h1 + (2m)h2]/M
And finally;
Xf = [(M-2m)h1 + (2m)(h2 + .75)]/M
Subtract;
Xf - Xi = (2m)(.75)/M=(2*3.5*0.75)/(68+3.5)=0.0734m

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