The population in the world can be simulated using the model /= (1 −/) , where p is population, pm is the maximum capacity, and k is the growth rate. Using Euler’s method, simulate the world’s population from 1950 to 2000. The initial conditions are p0(1950)=2555 million, k=0.026/yr, and pmax = 12,000 million. Calculate your results and compare with the true data below:

Athin walled concentric tube exchanger is used to cool engine oil from 160°c to 60°c with water that is available at 25°c acting as a coolant. the oil and water flow rates are each at 2 kg/s, and the diameter of the inner tube is 0.5 m and the corresponding value of the overall heat transfer coefficient is 250 w/m2. oc. how long must the heat exchanger be to accomplish the desired cooling? cpwater=4.187 kj/kg-candcpengine el=2.035 kj/kg·°c, oil . 120]