- Variation of 'g' with height (or altitude)?

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What is the dissolution enthalpy (dissolving) can be determined using a coffee cup calorimeter? PICKED AND PAID FOR SEATS BUT THEY DO NOT COME UP? Two forces of same magnitude act at a point.The square of their resultant is 3 times the product of their magnitudes.The angle b/w them is? Calculating for frequency and wavelength with given energy of 249.4.
how do i work with that? What is the specific heat (Fe) ?