MateingPhysics HW Google Chrome OaklonCCPIIY 221-001GSpnng2017 Problem 12 31 Pro

Question

MateingPhysics HW Google Chrome OaklonCCPIIY 221-001GSpnng2017 Problem 12 31 Problem 12.31 The 30-m-long, 94 kg rigid beam in the following figure supported at each end An 70 kg student stands 20 m 20 m Support 1 Support 2 O Ask me anything OSHIBA Express your answer to two saaniticant fig ures and include the appropriate units Submit Correct Part B How much upward force does the support 2 exert on the beam? Express your answer to two signaricant fig and include the appropriate units ures 1600 N Incorrect; Try Again: 3 attempts remaining

Explanation / Answer

here,

length , l = 3 m

mass of beam , m1 = 94 kg

mass of student , m2 = 70 kg

let the upward force at support 2 be N2

equating the moment of force about 1

m2 * g * 2 - N2 * l + m1 * g * l/2 = 0

70 * 9.81 * 2 - N2 * 3 + 94 * 9.81 * 3/2 = 0

solving for N2

N2 = 918.87 N

the upward force at support 2 is 918.87 N or 9.2 * 10^2 N

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