PHYS 101 OCH Spring 2017 8.43 Problem 8.43 A 30m long rigid beam with a mass 140

Question

PHYS 101 OCH Spring 2017 8.43 Problem 8.43 A 30m long rigid beam with a mass 140 kg is supported at each end. An 80 kg student stands 2.0 m from support 1. Figure 1 of 1 2.0 m 3.0 m Support 2 Support Part A How much upward force does support 1 exert on the beam? (Egure.) Express your answer to two significant figures and include the appropriate units. Fi Value Units Mr Answers Submit Incorrect. Try Again; 8 attempts remaining 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. Value Units My Answers Gheu

Explanation / Answer

1. Net torque at the other end is zero

3*F1 = 140*9.8*1.5+80*9.8*1

F1 = 947.3N

Net force is zero

F2 = mg-F1

= 140*9.8 - 947.3

= 424.7N

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