What is the main thing that holds soil in place ?

Consider a u-tube whose arms are open to the atmosphere. now equal volumes of water and light oil (ρ = 49.3 lbm/ft3) are poured from different arms. a person blows from the oil side of the u-tube until the contact surface of the two fluids moves to the bottom of the u-tube, and therefore, the liquid levels in the two arms are the same. if the fluid height in each arm is 30 in, determine the gage pressure exerted by the person on the oil by blowing.

What is the moment of inertia i of this assembly about the axis through which it is pivoted? express the moment of inertia in terms of mr

Aproton is shot from the negative disk toward the positive disk. what launch speed must the proton have to just barely reach the positive disk?