Vector Product Question (Mathematical Methods in Physics Course)

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The discussion revolves around difficulties in solving vector product problems from a Mathematical Methods in Physics course. The user seeks assistance with two specific homework questions, particularly struggling with finding vector A in the second problem after substituting vector B in the first. The forum guidelines emphasize the importance of showing work in problem-solving. The user expresses urgency for help, indicating a need for prompt responses. Overall, the thread highlights common challenges faced in understanding vector calculus concepts.
melampyge
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Hey guys,

I can't solve the first two problems. Can you help me please ASAP?

http://img694.imageshack.us/img694/5562/hw1e.jpg
 
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Per the forum guidelines, please show your work in attempting to solve the problem.
 
In the first question i just substitute the vector B in the equation B=del cross A and find it but in the second question it asks me to find A. That's the problem.
 
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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