The 5.4-kg ball and the attached light rod rotate in the vertical plane about the fixed axis at o. if the assembly is released from rest at θ = 0 and moves under the action of the 107-n force, which is maintained normal to the rod, determine the velocity v of the ball as θ approaches 90°. treat the ball as a particle.

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]