B) use the first law of thermodynamic to calculate au for the following situations: (i) a coiled spring unwinds producing 153 j of work and losing 37 j as heat to friction (1 mark) (ii) an insulated bucket of water is stirred by a paddle, which provides 289 j of work. (1 mark) (iii) adding 1 kj of heat to a sample of gas in an isovolumetric process. (1 mark) (iv) the isothermal compression of a gas from 26 l to 5 l. (1 mark) (v) the isobaric expansion of a gas from 5 l to 18 l at a constant pressure of 950 kpa caused by the addition of 15.6 kj of heat.