Angela is designing a wind-up toy that uses elastic bands. She conducts an experiment to find which iype of rubber band to use in her design. Her results show that the thicker and longer rubber band would move the toy the farthest. She concludes that thicker and forger rubber bands should be included in her design. Which is true about her conclusion?

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]