Reference no: EM131002164
1. A hemispherical salad bowl has radius R. We place an iron ball with radius r inside the bowl. Assume that 2r ≤R. Then we pour water into the bowl until the height of water is h.
(a) Assume 0 ≤ h ≤ 2r. Calculate the total volume of water.
(b) Assume 2r ≤ h ≤ R. Calculate the total volume of water.
Suggestions: You can check your solution! Your two answers should agree when
h = 2r. Also, you know what your answer should be when h = R.
2. Two long cylinders have radii r and R respectively (with r ≤ R) and their axes meet at a right angle. We want to compute the volume V of their intersection.
(a) Set up an integral whose value equals V. Leave your answer indicated as an integral.
Note: For those interested, there isn't any "nice" antiderivative for this function. Specifically, we can prove that the antiderivative we want is not an elementary function.
(b) Let a = R/r. Use a substitution to show that V = r3 F (a). In other words, we can write the volume V as r3 times an expression that depends only on a (and not on R or r separatedly). Write a formula for F.
Note: This result can be interpreted geometrically via scaling. Imagine that we multiply the radii of both cylinders by a factor of k (thus leaving a unchanged).
Convince yourself that the new volume should be exactly k3 times the old volume. That is what V = r3 F (a) means.
Hint: You can check your final answer: visit Wolfram Alpha online and ask it to compute the value of F (2). It should be approximately 12.16.
Note: This question can be solved in various ways and your grader is not a mindreader. Make sure to present your answer in a clean, organized, and well-explained manner. If your grader cannot understand what you are doing, you will get no credit, even if your answer is correct.
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: A hemispherical salad bowl has radius R. We place an iron ball with radius r inside the bowl. Assume that 2r ≤R. Then we pour water into the bowl until the height of water is h. Assume 0 ≤ h ≤ 2r. Calculate the total volume of water.
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