9.52 High-speed passenger trains are streamlined to reduce shear force. The 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? These two power calculations will be answers (c) and (d), respectively. Assume 7 = 10°C and that the boundary layer is tripped at the front of the train. 10 m Problem 9.52

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9.52 High-speed passenger trains are streamlined to reduce shear force. The 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? These two power calculations will be answers (c) and (d), respectively. Assume

T =

1 0^{?} C

and that the boundary layer is tripped at the front of the train. Problem 9.52

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