document.write( "Question 1013088: a bus of total weight 20000n is packed 5m from one end of a bridge of uniform weight 60000n. if the length of the bridge is 20m calculate the reaction at the supports. \n" ); document.write( "

Algebra.Com's Answer #631113 by Fombitz(32388) $\"\"$ $\"About$

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Let A be the reaction at the left side of the bridge, B the reaction at the right.
\n" ); document.write( "Force equation:
\n" ); document.write( " $\"A%2BB=20000%2B60000\"$
\n" ); document.write( " $\"A%2BB=80000\"$
\n" ); document.write( "Moment equation (using the left reaction point as zero point):
\n" ); document.write( " $\"20000%285%29%2B60000%2810%29=B%2820%29\"$
\n" ); document.write( " $\"B=1000%285%29%2B3000%2810%29\"$
\n" ); document.write( " $\"B=5000%2B30000\"$
\n" ); document.write( " $\"B=35000\"$ $\"N\"$
\n" ); document.write( "Then,
\n" ); document.write( " $\"A%2B35000=80000\"$
\n" ); document.write( " $\"A=45000\"$ $\"N\"$
\n" ); document.write( " \n" ); document.write( "

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