Which statement is true when two objects are 20 miles apart but one is much bigger? A: Gravitational attraction exists between the two objects.

B: Since one is so small there will be no gravitational attraction.

C: Since one object is so large only it has any gravity.

D: Since one is so large there will be no gravitational attraction.

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.