High-speed passenger trains are streamlined to reduce shear force. Th e cross section of a passenger car of one such train is shown. For a train 81 m long, estimate the shear force (a) for a speed of 81.1 km/hr and (b) for one of 204 km/hr. What power is required for just the shear force at these speeds? Th ese two power calculations will be answers (c) and (d), respectively. Assume T = 10°C and that the boundary layer is tripped at the front of the train.

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10 m