10 Google Chrome emViewPottiset anextBassignmentProblemlD 72429364 OaklonCCPHY?

Question

10 Google Chrome emViewPottiset anextBassignmentProblemlD 72429364 OaklonCCPHY? 21.001 GSprng2017 Problem 12 31 Problem 12.31 How much upward force does the support 1 exert on the beam? Express your answer two significant fig ures and include the appropriate units. The 30-m-long 94 kg rigid beam in the toaowng figure supported at each end An kg student stands20m Value Units Submit Mo Answers Give Up Incorrect Try Again: 3 attempts remaining Part B How much upward force does the support 2 exert on the beam? Express your answer to two significant figures and include the appropriate units. Support I Support 2 Value Units M OAsk me anything

Explanation / Answer

we consider the body weight is acting downward

W=mg =70*9.8N for the student

lets consider the upward force on support 1 is F1

taking moment from the side of F1

we write

2*70*9.8+ 1.5*9.8*94=3F2 [ the beam weight is acting in the center of the beam length 3/2=1.5m]

or F2=(2*70*9.8+ 1.5*9.8*94)/3=917.93N

now total downwad force on the rrigid beam=(70+94)*9.8N=1607.2N

we know to reachh equilibrium F1+F2=1607.2N

or F1=1607.2N- 917.93N=689.27N

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