A water tunnel is used to study the characteristics of a new unmanned submarine. The idea would be to study a 1:5 scale model with fresh water 20C, whereas the submarine would be used in seawater at 15C. The submarine is to be used at a velocity of 30 m/s. What would the velocity of the water tunnel be using the model? (15 points) Neglect compressibility effects.

While strolling downtown on a saturday afternoon, you stumble across an old car show. as you are walking along an alley toward a main street, you glimpse a particularly stylish alpha romeo pass by. tall buildings on either side of the alley obscure your view, so you see the car only as it passes between the buildings. thinking back to your physics class, you realize that you can calculate the car's acceleration. you estimate the width of the alleyway between the two buildings to be 6 m. the car was in view for 0.6 s. you also heard the engine rev when the car started from a red light, so you know the alpha romeo started from rest 4 s before you first saw it. find the magnitude of its acceleration.