Find the error in the following proof that 2 = 1. consider the equation a = b. multiply both sides by a to obtain a 2 = ab. subtract b 2 from both sides to get a 2 − b 2 = ab − b 2 . now factor each side, (a + b)(a − b) = b(a − b), and divide each side by (a − b) to get a + b = b. finally, let a and b equal 1, which shows that 2 = 1.

Steel is coated with a thin layer of ceramic to protect against corrosion. what do you expect to happen to the coating when the temperature of the steel is increased significantly? explain.

Which one from below is not one of the reasons of planning failures? (clo3) a)-planner is careless. b-planner spend less time in the field but more time on the desk c)-planner is not qualified d)-planner does not have sufficient time to properly plan

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]