# Physical Science

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A bridge in Sweden carries the Gota Canal over a highway. What, if anything happens to the load on the bridge when a boat passes across it in the canal?

• Physical Science -

it increases slightly, due to the water height increasing slightly.

• Physical Science -

Ignoring waves and pressure variations due to velocity, nothing at all. The weight of the boat displaces an equal weight of water.

• Physical Science -

The water level does not go up, steady state. It is a canal, not a closed basin.

• Physical Science -

OK, I agree with Prof Damon, if it is an open canal, water level is constant.

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