hard · Enhanced ACT science
A materials scientist heated four metal rods of equal length and cross-section, made of different metals, and measured how much each expanded (in mm) at various temperature increases:
| Temp increase (°C) | Metal J | Metal K | Metal L | Metal M |
| :--- | :--- | :--- | :--- | :--- |
| 50 | 0.60 | 0.45 | 0.90 | 0.30 |
| 100 | 1.20 | 0.90 | 1.80 | 0.60 |
| 150 | 1.80 | 1.35 | 2.70 | 0.90 |
A fifth rod is an alloy that expands exactly the average amount of Metals J and M at every temperature increase tested.
At a temperature increase of 100°C, the alloy rod's expansion would be closest to:
- 0.75 mm
- 0.90 mm
- 1.05 mm
- 1.20 mm
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