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Help needed on AS Physics Mechanics questions please!

1) A uniform beam of weight 230N and of length 10m rests horizontally on the tops of two brick walls, 8.5m apart, such that a length of 1m projects beyond one wall and 0.5m projects beyond the other wall
- Calculate the support force of each wall on the beam
- Calculate the force of the beam on each wall

2) A uniform bridge span of weight 1200kN and of length 17m rests on a support of width 1m at either end. A stationary lorry of weight 60kNis the only object on the bridge. Its centre of mass is 3m from the centre of the bridge. Calculate the support force on the bridge at each end.

3) A uniform plank of length 5m rests horizontally on two bricks that are 0.5m from either end. A child of weight 200N stands on one end of the plank and causes the other end to lift, so it is no longer supported at that end
- Calculate the weight of the plank
- Calculate the support force acting on the plank from the supporting brick

Thanks!

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