Recent content by azureth

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    Graduate Model Dynamics of Unit Mass Sliding Down y=f(x) Under Gravity

    Well, as for arbitrary two dimensional curvilinear motion, the acceleration components are: a_{n}=\frac{v^2}{r} a_{t}=\frac{dv}{dt} The first refers to the acceleration components normal to the tangent and thus the second refers to the acceleration components parallel to the tangent.The r...
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    Suggestion Physics olympiad discussion

    OK, I see. Sorry for the unreasonable suggestion.
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    Suggestion Physics olympiad discussion

    Thank you very much.
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    High School The velocity of photon in media

    Thanks.
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    Suggestion Physics olympiad discussion

    Could you please offer me more website on physics problems. I have to admit there are a great number of maths problems on the Internet, but what I want is physics problems. Thanks a lot.
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    Suggestion Physics olympiad discussion

    Actually what I mean is physics problems
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    High School The velocity of photon in media

    Actually I am talking about common media with its refraction index given.
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    High School The velocity of photon in media

    what is the velocity of photon in media, c or c/n ?
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    Undergrad Calculation of Spin of Ball in Table Tennis

    I think the spin of the ball (or the change of angular velocity) is due to the friction. You should consider angular momentum in this case.
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    Suggestion Physics olympiad discussion

    also how about raising a kind of weekly problem set or somehing like that for olympiad
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    Suggestion Physics olympiad discussion

    can we have a special area for physics olympiad discussion and problem collection(like problem papers of ipho, apho and usapho)?
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    Undergrad Impulse, momentum, and force during motion around a circle

    I=mv2-mv1 Here I,v1,v2 are all vectors.I is the impulse.v1 is the initial velocity.v2 is the final velocity.Surely you can not say v1-v2=0(remember v1 and v2 are vectors ).
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    Undergrad Impulse, momentum, and force during motion around a circle

    The momentum is a vector.Though the magnitude of it in your problem is a constant,it changes in its direction.
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    Undergrad Help: maximum force of an object when given impulse and time on a graph

    Is the slope still a constant during the fall between 6s-8s?
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    Undergrad Understanding Centripetal Force: How It Works in an Inertial Frame

    There is a centripetal acceleration for an object that is moving along a non-straight curved path so according to Newton second law there must be a centripetal force,which might be a component of the total force, acting on it .