- How do you derive the formula for factor of safety in strength and materials?

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How many elements are there in lanthanides? The sum of two integers is 74. The larger is 26 more than twice the smaller. Find the two integers? A substance has a nonzero resistance even when cooled to absolute zero. what can you predict about the substance's structure? How many 1st and 2nd and 3rd order streams are shown in this dairgram? I've counted 10 1st. I need help finding the 2md and 3nd.? Im building a 3 meter suspension bridge out of 2x4 s. It needs to be able to hold 12x its weight. Will the 2x4 s be able to support that?