A U-tube open at both ends is partially filled with water (density of water = 1000 kg/m3). The right arm is shielded from any air motion, while air (density of air = 1.2 kg/m3) is blown across the top of the left arm at 20 m/s. What is the height difference between the surfaces in the U-tube?

An architect plans to use solar energy to heat the next house he designs. what principle of absorption and infrared energy can be applied to the design of the new house? how could she apply to those principals?

Select the correct answer. what does the process of natural selection involve?

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?