Recent content by vle1

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    Final Exam Prep: Practice Question

    Homework Statement http://img225.imageshack.us/img225/3338/question10em4.jpg Homework Equations This is a practice question for final exam, I very much appreciate if someone can help.
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    How Do You Calculate Orbital Speed Using Kepler's Laws?

    Homework Statement http://img518.imageshack.us/img518/2716/question11mediumjj8.jpg This was an extra question for final exam some years ago, i hope that some one can direct me to obtain the right answer. I could not good find equations that I learn to answer this
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    Physic Question: Get Full Explanation

    Homework Statement The information was posted as an image http://img300.imageshack.us/img300/5259/question01em4.jpg Homework Equations The Attempt at a Solution This question is confused, I very much appreciate if some one can help. It is NOT a homework question, it was a problem in...
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    Force Law for 2D Motion with Const a,b,w: F = F(r)

    I have to admit that I'm stupid, I know the Newton's Second Law. But how to get to r(t) = aCos(wt)x^ + bSin(wt)y^
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    Force Law for 2D Motion with Const a,b,w: F = F(r)

    Can you explain more in detail, it still confuses me. How do we derive the fomular of Newton's Second Law F=ma to this kind of fomular:confused:
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    Force Law for 2D Motion with Const a,b,w: F = F(r)

    A body of mass m moves under the influence of a force F in two dimensions. It has an trajectory r(t) = aCos(wt)x^ + bSin(wt)y^ a = alpha b = beta w = omega, they are not a, b, and w in alphabet x^,y^: vector unit a,b,w are constant. Find the force law F = F(r) which corresponds to...
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