Experimental set-up #2: The rotating case Instructions: Fill the water tank with tap water using the cups. Start the motor. Wait until the water is "spun-up" (all the water spins at the same rotation rate) *WHEN YOU ARE HERE, wave and we will discuss the physics of spin-up * Drop one drop of dish soap in the water. Choose 2 colored dyes and drop a couple of drops of dye of each, in 2 locations separated by a few inches. Observe and describe the behavior of the dye in the water. Questionnaire (same as before but your answers should be different) 1) Describe the vertical motion of the dye: 2) Describe the lateral motion of the dye (does the dye move side-to-side?): 3) Do the 2 dyes mix together? 4) Does the motion look organized? Instructions (cont'd): Use a pen to introduce a small perturbation (mechanical stirring) once. The stirring forces different parts of the fluid to move past each other. 5) What happens when you introduce a small perturbation (mechanical stirring)? 6) Can you think of an example in the real world where fluids have this behavior