A water wave tank has eight-point sources evenly spaced along a circle. They all oscillate with the same frequency but as you go around the circle each point source is exactly out of phase with its closest neighbors. 1) How many nodal lines are there and where are they?
2) What principle allows you to make this assertion?

Dalton’s model of an atom is the best described as a) a solar system b) a solid sphere c) a cloud d) a scoop of chocolate chip ice cream

In science and physics what is the standard unit of measure for speed?

Amass attached to a spring is displaced from its equilibrium position by 5cm and released. the system then oscillates in simple harmonic motion with a period of 1s. if that same mass–spring system is displaced from equilibrium by 10cm instead, what will its period be in this case? a mass attached to a spring is displaced from its equilibrium position by and released. the system then oscillates in simple harmonic motion with a period of . if that same mass–spring system is displaced from equilibrium by instead, what will its period be in this case? a) 0.5sb) 2sc) 1sd) 1.4s