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The image depicts a balance scale with two balls suspended in water. Both balls weigh 1 kg, but one is made of iron (Fe), and the other of aluminum (Al). The question asks which way the scale will tip.

Let's break it down:

1. **Mass of the balls:** Both balls have the same mass (1 kg each), so if there were no other factors, the scale would remain balanced.

2. **Volume of the balls:** Iron is denser than aluminum, meaning that for the same mass, the iron ball will have a smaller volume than the aluminum ball. The formula to relate density, mass, and volume is:
   
   \[
   \text{Density} = \frac{\text{Mass}}{\text{Volume}}
   \]

   Since the density of iron is higher than aluminum, the aluminum ball must have a larger volume than the iron ball.

3. **Buoyant force:** When an object is submerged in water, it experiences a buoyant force equal to the weight of the displaced water, according to Archimedes' principle. Since the aluminum ball has a larger volume, it will displace more water than the iron ball, and thus, it will experience a greater buoyant force.

4. **Effect on the scale:** 
   - The iron ball, with its smaller volume, will experience less buoyancy, so it will appear heavier in water.
   - The aluminum ball, with its larger volume, will experience more buoyancy, so it will appear lighter in water.

**Conclusion:** The scale will tip toward the side with the iron (Fe) ball because the aluminum (Al) ball experiences a larger buoyant force, making it effectively lighter in water.

Would you like further details or explanations?

Here are 5 related questions you might consider:
1. What is the density of iron compared to aluminum?
2. How does Archimedes' principle apply to floating and sinking objects?
3. How would the result change if the balls were placed in a different liquid?
4. What is the mathematical formula for buoyant force?
5. How does the volume of a solid object affect the amount of water displaced?

**Tip:** When comparing objects submerged in a liquid, always consider the combined effects of mass, volume, and buoyancy.

Which way does the scale tip when a 1kg iron (Fe) ball and a 1kg aluminum (Al) ball are both submerged in water?

This problem explores how buoyant force affects two balls of equal mass (1kg) but different densities (iron and aluminum) when submerged in water. Archimedes' principle helps explain why the aluminum ball experiences more buoyancy, tipping the scale toward the iron ball. Suitable for students in Grades 7-10.

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