SOLUTION: 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.

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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.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the reaction at the left side of the bridge, B the reaction at the right.
Force equation:
A%2BB=20000%2B60000
A%2BB=80000
Moment equation (using the left reaction point as zero point):
20000%285%29%2B60000%2810%29=B%2820%29
B=1000%285%29%2B3000%2810%29
B=5000%2B30000
B=35000N
Then,
A%2B35000=80000
A=45000N