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  1. R

    Different views

    very good! i get some new ideas
  2. R

    An interactive problem

    Maybe there is something wrong with the bulb!
  3. R

    Angular velo.

    here is my solution to this question i second VietDao29's idea! here is my solution to this question! my english is poor,so i don't discribe how i do it! i think you can get a idea about it and understand the equations i make! i want to make friends with you all it is helpful to...
  4. R

    Courses Math course guidance

    I second Brad Barker's suggestion. i major in physics! i think math is useful to all the students, my english is poor,i cannt express myself freely,but i want to help you! i want to make friends to you all,