A skier starts down a 14 ∘ incline at 2.0 m/s, reaching a speed of 15 m/s at the bottom. Friction between the snow and her freshly waxed skis is negligible. How long does it take the skier to reach the bottom?

8.29 two streams containing pyridine and acetic acid at 25°c are mixed and fed into a heat exchanger. due to the heat-of-mixing effect, it is desired to reduce the temperature after mixing to 25°c using a stream of chilled ethylene glycol as indicated in the diagram. calculate the mass flow rate of ethylene glycol needed. the heat capacity of ethylene glycol at these conditions is approximately 2.8 kj/(kg k), and the enthalpy change of mixing (δmixh) is given below.