Find Volume Using Cylindrical Coordinates

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To find the volume of the solid enclosed by the sphere r^2 + a^2 = a^2 and the cone z = r cot φ using cylindrical coordinates, the volume integral is set up as ∫∫∫zrdrdθ. The limits for z are from r cot φ to √(a^2 - r^2), r ranges from 0 to a/csc φ, and θ varies from 0 to 2π. The user initially sought clarification but later resolved the issue independently. The discussion highlights the application of cylindrical coordinates in volume calculations. Understanding the limits of integration is crucial for accurately determining the volume.
bodensee9
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Can someone explain to me how to find the volume of the following? I am asked to use cylindrical coordinates to find the volume of the solid enclosed by the sphere r^2+a^2 = a^2 and by the cone z = r cot φ where φ is some fixed angle between 0 and pi/2?

I would have thought that the volume would be ∫∫∫zrdrdθ, where z runs between r*cot φ and √(a^2-r^2), r runs between 0 to a/csc φ, and θ runs from 0 to 2pi. Thanks!
 
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Never mind, figured it out. Thanks.
 
Question: A clock's minute hand has length 4 and its hour hand has length 3. What is the distance between the tips at the moment when it is increasing most rapidly?(Putnam Exam Question) Answer: Making assumption that both the hands moves at constant angular velocities, the answer is ## \sqrt{7} .## But don't you think this assumption is somewhat doubtful and wrong?

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