solution_pdf_courseuserassignment=9207190

# solution_pdf_courseuserassignment=9207190 -...

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1 This print-out should have 12 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points A 10,000 N vehicle is stalled one-quarter the way across a bridge. Calculate the additional reaction Forces that are supplied at the supports on both ends oF the bridge. 1. 6666 N at the leFt and 3333 N at the right. 2. 8000 N at the leFt and 2000 N at the right. 3. 7500 N at the leFt and 2500 N at the right. correct 4. 9000 N at the leFt and 1000 N at the right. Explanation: Let : W = 10000 N . Let d be the distance From the leFt end (sup- porting a weight oF F ) and 3 d be the distance From the right end (supporting a weight oF f ). Since the bridge is in equilibrium, F + f = W f = W - F and D = 3 d , so F d = f (3 d ) ( W - f ) = 3 f W = 4 f f = W 4 = 2500 N supported at the right end and f = W - f = 3 4 f = 7500 N supported at the leFt end. 002 (part 1 oF 2) 10.0 points A uniForm brick oF length 12 m is placed over the edge oF a horizontal surFace. x 12 m What maximum overhang is possible For the single brick (without tipping)? Correct answer: 6 m. Explanation: Let : L = 12 m and n = 1 . The center oF mass (CM) oF a stack oF n bricks (oF equal mass M ) is x n s i =1 x i M n s i =1 M = 1 n n s i =1 x i , where x i is the CM position oF the i th brick. The CM oF a single brick is in its middle, so the maximum overhang is x = 1 2 L = 1 2 (12 m) = 6 m . x 12 m 003 (part 2 oF 2) 10.0 points Two identical uniForm bricks oF length 12 m are stacked over the edge oF a horizontal sur- Face. x

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## This note was uploaded on 11/22/2009 for the course PHYS 24131 taught by Professor Montogomery during the Fall '09 term at Northwest MS.

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