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Q1. the magnitude of dot and cross product of two vectors is (6sqrt3) and (6) respectively. find the angle between the vectors. Q2. a tractor of weight 15,000 N crosses a single span bridge of weight 8000N and of length 21m. the bridge span is supported half a meter from either end. the...

Q. Given that A= 2i(hat) + 3j(hat) and B= 3i(hat) - 4j(hat), find magnitude of C=A+B and D=3A-2B for the above questiont the problem i am having is that value of cos theta is coming out to be negative when calculating dot product of A and B. please help and show the calculation steps i should take!

describe the anomalous behaviour in periodic trend of different elements in third period of periodic table? i just want sites and links for reference because i cannot find sufficient information in any of my books. if u know any information other than this that will we helpful too