A loaded railroad car is rolling at a constant velocity when it couples with a spring and dashpot bumper system. After the coupling,  the motion of the car is defined by the relation x 5 60e 24.8t  sin 16t, where x and t are expressed in millimeters and seconds, respectively. Determine the position, the velocity, and the acceleration of  the railroad car when (a) t 5 0, (b) t 5 0.3 s

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Pressurized pipe flow

A 15-kilometer-long pipe with a pipe diameter of one meter transports water at a speed of one meter per second. The pipe has a friction coefficient of 0.005. Calculate the frictional head loss?