a 1000 kg rocket ship is traveling toward mars at 100 m/s, until it is acted upon by a force of 20 kn (in the direction of its motion) for 8 s. the force is thought to originate from an unidentified foreign object. what is its resulting velocity

The space between two 15-in.-long concentric cylinders is filled with glycerin (viscosity = 8.5 × 10-3 lb·s/ft2). the inner cylinder has a radius of 1 in. and the gap width between cylinders is 0.1 in. determine (a) the torque and (b) the power required to rotate the inner cylinder at 180 rev/min. the outer cylinder is fixed. assume the velocity distribution in the gap to be linear.