- What is Physical or abstract systems with examples..?

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If an equilateral triangle has sides of (3x^2 + 8x - 1), what is its perimeter? I know a train at a high rate of speed will total a car, but would a train at ONLY 5-10 MPH total a car? What is the shape of ch4n2o (Urea) and what are the angles of it.? Use bond energies to calculate the enthalpy of combustion of one mole of methanol in kJ per mole methanol.? Use bond energies to calculate ΔHrxn for the following reaction: N2(g)+3H2(g)→2NH3(g)?