a massive 400 lb sumo wrestler and a tiny 100 lb jockey run into each other. which one exerts a greater force on the other?

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.

Convection currents are caused by differences in what two things?

An object in mechanical equilibrium is an object