You are lost in the wilderness, carrying only a piece of aluminum foil. Thanks t

Question

You are lost in the wilderness, carrying only a piece of aluminum foil. Thanks to diligent study in your biology class, you remember which mushrooms are poisonous, and you are able to pick others that won't kill you. Your talents in basket weaving also pay off magnificently, as you create a basket and devise a plan to line it with aluminum foil, making a solar cooker. Mmmm, roast mushrooms! The basket is a section of a sphere with radius 21.0 cm. How far from the bottom of the basket should you place the mushrooms to cook them most efficiently using the Sun's rays?

Explanation / Answer

The mushrooms should be placed at the focal point which is R/2 = 21.0/2 =10.5cm
The best shape is parabolic

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