Help me Shown is a picture of two toy trains getting ready to collide. If the collision is non-elastic, what is the total momentum of

the train cars after the collision?

a

-10 kg·m/s

b

10 kg·m/s

c

70 kg·m/s

d

50 kg·m/s

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.