Complete the following sentences:
A piece of wood is held under water. The upthrust on it will be ………..the weight of the wood piece.

Answer

To complete the sentence: "A piece of wood is held under water. The upthrust on it will be ………..the weight of the wood piece."

**Step-by-step solution:**

1. **Understanding Upthrust:** Upthrust, or buoyant force, is the upward force exerted by a fluid on an object immersed in it. According to Archimedes' principle, this force is equal to the weight of the fluid displaced by the object.

2. **Density Comparison:** The density of the wooden piece is less than the density of water. This is a crucial point because it determines whether the object will float or sink.

3. **Applying Archimedes' Principle:** Since the density of wood is less than that of water, when the wooden piece is submerged, it displaces a volume of water that weighs more than the weight of the wood itself.

4. **Conclusion on Upthrust:** Therefore, the upthrust (buoyant force) acting on the wooden piece will be greater than the weight of the wooden piece.

5. **Final Sentence Completion:** Thus, we can complete the sentence as follows: "A piece of wood is held under water. The upthrust on it will be **greater than** the weight of the wood piece."

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