Recent content by erpoi

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    Calculating the Magnitude of Vector CD Using the Cosine Rule

    oops yes you are right, ok i use the cos rule and do get an answer(which is correct), but I am after it as an exact value (root66). How would i get that? Thanks!
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    Calculating the Magnitude of Vector CD Using the Cosine Rule

    C, D are points defined by position vectors c and d. Magnitude of c is 5, mag of d is 7, c dotproduct d is 4 ie c.d = 4, find the magnitude of vector CD. So i started this way c.d = magc*magdcos@ = 35cos@, @ = 83.4 degrees But still no idea how do get magnitude of vector cd. Thank you!
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    Complex Numbers Tips: Find Mod/Arg, Express in Cartesian

    Yes I have never heard of it, does it make doing the question easier? If so, can you explain?
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    Complex Numbers Tips: Find Mod/Arg, Express in Cartesian

    Hello I'm still very basic in this, and I don't understand your notation in the second part. Would you be able to explain further? Thanks!
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    Complex Numbers Tips: Find Mod/Arg, Express in Cartesian

    I was wondering if someone can check my solutions and perhaps give me a faster more logical way of working through this question. Thanks. Homework Statement If z = 1 + i*root3 i) Find the modulus and argument of z ii) Express z^5 in Cartesian form a + ib where a and b are real iii)...
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    Isotopes of an element differ in physical properties

    Im stuck on this question. Isotopes of an element differ in physical properties but not chemical properties. Explain this in terms of structure. I know isotopes have the same number of protons and diff neutrons, but don't know how to answer the question. Thanks!
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