Part A Part B Problem 8.43 Part A How much upward force does support 1 exert on

Question

Part A

Part B

Problem 8.43 Part A How much upward force does support 1 exert on the beam? (Figure 1) A 3.0-m-long rigid beam with a mass 100 kg is supported at each end. An 80 kg student stands 2.0 m from support 1 Express your answer to two significant figures and include the appropriate units. F1 = 751 N Submit My Answers Give Up Correct Figure 1 of 1 Part B How much upward force does support 2 exert on the beam? Express your answer to two significant figures and include the appropriate units F Value N 2.0 m 3.0 m Submit My Answers Give Up Support 1 Support 2 Incorrect; Try Again; 5 attempts remaining

Explanation / Answer

As per guide lines i am working first problem please post second question next time

Apply Newtons second law forces

n1 + n2 - mg - Mg = 0

the net torque under equlibrium condition is zero

T = 0

n2 ( 3 m)- Mg ( 1.5 m) - mg ( 2 m) = 0

n2 = Mg ( 1.5) + mg ( 2 m)/3

= 100 kg( 9.8) (1.5) + 80 ( 9.8) ( 2 m)/3

=1012.7 N

n1 = g( M+ m) - n2

= (9.8) ( 100 + 80) - 1012.7 N

=751 N

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