University Physics - 13 Edition - Chapter 17 - Problem 25dq
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Glider pilots in the Midwest know that thermal updrafts

University Physics | 13th Edition

Problem 25DQ

Glider pilots in the Midwest know that thermal updrafts are likely to occur in the vicinity of freshly plowed fields. Why?

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Solution 25DQ Step 1: Dense,broken or overcast middle and high cloudiness shade the surface cutting off surface heating and convective thermals.on a generally warm bright day but with patchy middle or high cloudiness,cumulus may develop,but the thermals are few and weak. The high-level cloudiness may drift by in patches.thermals surge and wane as the cloudiness decreases and increases.never anticipate optimum thermal soaring when plugged by these mid and high-level clouds. Middle-level convective clouds develop in updrafts at and just below the cloud levels.they do not extend upward from the surface.if a sailplane can reach levels near the cloud bases.the problem is reaching the convective level.

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