Discussion
Cylinder speed is raised from \( 15 \) to \( 20 \) m/s. The kinetic energy of impact per unit mass rises by a factor of
Answer: A
Correct answer: 1.78
Kinetic energy per unit mass varies with the square of the speed:
\[ \frac{E_2}{E_1} = \left(\frac{20}{15}\right)^2 = 1.333^2 = 1.78 \]
The distractor 1.33 is the speed ratio itself, before squaring. The square law is the whole reason cylinder speed is such a sensitive adjustment: a 33 per cent increase in speed delivers a 78 per cent increase in impact energy, which is why damage climbs so much faster than threshing improves.
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