How much force is required to accelerate a mass of 12kg at 3.0 m/s ^ 2

What sort of waves exhibit the doppler effect?

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.

Amagnetic field applies forces on: a)static chargesb)moving chargesc)water flow