| .. | .. |
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| 1702 | 1702 | |
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| 1703 | 1703 | #### Answer |
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| 1704 | 1704 | |
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| 1705 | | -D) |
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| 1705 | +B) |
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| 1706 | 1706 | |
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| 1707 | 1707 | #### Explanation |
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| 1708 | 1708 | |
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| 1709 | | -The aerodynamic center is the point of application of the resultant of aerodynamic forces on a profile. It is distinct from the center of pressure (which moves) and the center of gravity. |
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| 1709 | +The aerodynamic centre (or centre of pressure) is the point where the resultant of all aerodynamic pressure forces (lift + drag) acts on the aerofoil. It lies on the chord line, typically near the quarter-chord point (~25% of chord from the leading edge). |
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| 1710 | + |
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| 1711 | +- **A (weight)** acts at the centre of gravity, not the aerodynamic centre. |
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| 1712 | +- **C (tyre pressure)** is irrelevant to aerodynamics. |
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| 1713 | +- **D (airflow at the leading edge)** describes the stagnation point, not the aerodynamic centre. |
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| 1710 | 1714 | |
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| 1711 | 1715 | ### Q84: Pressures are expressed in: ^t80q84 |
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| 1712 | 1716 | |
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