How Do You Calculate Cable Tensions in a Suspension Bridge with a Parked Truck?

[forcesand]

Homework Statement

A small massless suspension bridge of length 15.0 m and mass is suspended by two cables as shown below. A truck of mass 2500 kg is parked on the bridge at a distance of 4.0 m from the left cable. What are the tensions in cable 1 and cable 2?

Homework Equations

The Attempt at a Solution

I have started with the idea that the bridge is at equilibrium. But I don't know how to include the truck into the problem solving. Please help! Thanks!

 

[tiny-tim]

Welcome to PF

Hi forcesand! Welcome to PF!

Use moments (of forces).