***hurry***which equation is used to calculate the electric potential in an electric field from a point charge? v = k q/d^2 v = k q/d △v = △u/q △v = △u/e

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?

Consider the growth of a 20-nm-diameter silicon nanowire onto a silicon wafer. the temperature of the wafer surface is maintained at 2400 k. assume the thermal conductivity of the silicon nanowire is 20 wm-1k-1 and all its surfaces including the tip are subjected to convection heat transfer with the coefficient h = 1×105 wm-2k-1 and t∞ = 8000 k. when the nanowire grows to l = 300 nm, what is the temperature of the nanowire tip (t (x =