Question

Pictured below is a model for a train that is traveling at the steady speed of 50 m/s through standard air at sea level. The cross section of the train will be modeled as a semicircle so that the train itself is half of a circular cylinder. Neglect the effects of any airflow beneath the train. The engine car drives the train with a propulsive thrust, and there is a coupling connecting the engine car to the passenger car. Assume that the space between cars is negligible (picture not drawn to scale), and that this gap does not interfere with the growth of the boundary layer. Assuming the only source of drag is due to skin friction, calculate the driving thrust and the coupling force between cars in Newtons. 30 m50 m U =50m/s Engine Car Passenger Car 5 m Coupling

Answer 1

Gfve a rchseShoun belo moiel i havetligot the fte speed cf 50 ms hehueen lheCouplt rvina Huut Ju mTne ve ce Άλ

e d 113 x Sox PO R28 y393063.6 toco Cr Re t、38 16863-9S - 218 3 o 15% . 021 2.

ortebehoeen CausNeutuns C en Fe body d 劭m Cal 0ワ 5D eon 30 f - 29«2» N Co Forte behueen Cau in tlrutons Onte