What Force Does a Concrete Support Exert at One End of a Bridge?

[Hypnos_16]

Homework Statement

A hiker, who weighs 986 N, is strolling through the woods and crosses a small horizontal bridge. The bridge is uniform, weighs 3550 N, and rests on two concrete supports, one at each end. He stops one-fifth of the way along the bridge. What is the magnitude of the force that a concrete support exerts on the bridge at the near end

Weight of Person = 986N
Weight of Bridge = 3550N
d = 1/5th of Bridge length

Homework Equations

This is a torque question, so the equation is T = F x d
i know that the force is the person times gravity, but that's already done.
However i don't know the length of the bridge, I've tried dividing the mans mass by 5 and adding that to the bridge's weight, but to no prevail. i really need some help here guys

The Attempt at a Solution

no really attempts
T = 986 x 0.2
T = 197.2
T = 197.2 + 3550
T = 3747.2

 

[PhanthomJay]

Homework Statement

A hiker, who weighs 986 N, is strolling through the woods and crosses a small horizontal bridge. The bridge is uniform, weighs 3550 N, and rests on two concrete supports, one at each end. He stops one-fifth of the way along the bridge. What is the magnitude of the force that a concrete support exerts on the bridge at the near end

Weight of Person = 986N
Weight of Bridge = 3550N
d = 1/5th of Bridge length

Homework Equations

This is a torque question, so the equation is T = F x d
i know that the force is the person times gravity, but that's already done.
However i don't know the length of the bridge, I've tried dividing the mans mass by 5 and adding that to the bridge's weight, but to no prevail. i really need some help here guys

The Attempt at a Solution

no really attempts
T = 986 x 0.2
T = 197.2
T = 197.2 + 3550
T = 3747.2

Tis is a problem in equilibrium where the net sum of the torques from each force about any point must equal 0. Try summing torques about the right end of the bridge. You will have torques produced by both the person's weight force, the bridge's weight force, and the left support unknown force. Where does the resultant force of the bridge's weight act??