MasteringPhysics: Chapter 12-Google Chrome B https/session.masteringphysics.com/
ID: 1492733 • Letter: M
Question
MasteringPhysics: Chapter 12-Google Chrome B https/session.masteringphysics.com/myct/itemView?assignmentProblemID-56100028 Phys201-2016-Spring ane 12 Problem 12 61 Help Problem 12.61 Part A The 3.0 m-long 98 kg rigid beam in the following figure is supported eachend An 86 kg student stands 20 an from support 1 Eigure.b How much upward force does the support 1 exert on the beam? Express your answer to two signilficant figures and include the appropriate units. Fi Value Units My Answers Give U Part B How much upward force does the support 2 exert on the beam? Express your answer to two significant figures and include the units appropriate 3129 N Submit of 1 Incorrect, Try Again; 5 attempts remaining Contin 2.0 m Support I Support 2Explanation / Answer
the y component force is
n1+ n2 -mg- Mg = 0
the net torque acting on the beam is
T = 0
F1(0) + F2 ( 3m) - Mg ( 1.5) - mg( 2 m) = 0
3 F2 = 98 ( 9.8) ( 1.5) +86 ( 9.8) ( 2)
F2 = 1042 N
F1 = g ( m+ M) - F2
= 9.8 ( 86 +98) - 1042
=761.2 N