The problem is in the picture. frictional forces are neglected. we know the alpha angle and the constant value of velocity v. then find the value of speed "u" when the thread makes angle alpha with horizontal

Selma made a diagram to compare convection and radiation. which label belongs in the area marked x? must involve temperature differences between substances or objects only occurs when molecules are in direct contact involves the movement of fluids based on density differences can occur where there is little or no matter