The pilot of an airplane executes a vertical loop which in part follows the path of a four-leaved rose, r=(−600cos2θ)ft, where θ is in radians. His speed at A is a constant vP = 80 ft/s. He weighs 120 lb . Hint: To determine the time derivatives necessary to compute the acceleration components ar and aθ, take the first and second time derivatives of r=(−600cos2θ). Then, for further information, use v=r˙2+(rθ˙)2−−−−−−−−√ to determine θ˙. Also, take

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]