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.

A150 w lamp emits light of wavelength 590 nm uniformly in all directions. what is the photon flux (photons per unit area per unit time) on a small screen at a distance 2.3 m from the lamp? assume the photons are uniformly distributed over the surface of a sphere of radius 2.3 m.

Will give brainliest! jay rides his 2.0-kg skateboard. he is moving at speed 5.8 m/s when he pushes off the board and continues to move forward in the air at 5.4 m/s. the board now goes forward at 13 m/s. a. determine jay’s mass. b. determine the change in the internal energy of the system during this process.(express your answer to two significant figures and include the appropriate units.)

What’s #16 asking and how do i solve it?