Ells are constantly working to translate what they hear (english) into what they understand (their primary language). complicating this "double duty" is the fact that while working on the meaning of one sentence, they then completely miss the next thing the teacher says. for ells, then, how the teacher speaks is as important as what the teacher says.

Your target variable is δf, the magnitude of the difference in frequency between the waves emitted from the sonar device and the waves received by the device after reflecting off the whale. write an expression for δf in terms of the relevant frequencies using the subscript notation introduced above.

Consider a 1000 w iron whose base plate is made of 0.5 cm thick aluminum alloy 2024-t6 (ρ = 2770 kg/m3 and cp = 875 j/kg°c). the base plate has a surface area of 0.03 m2. initially, the iron is in thermal equilibrium with the ambient air at 22°c. assuming 90% of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°c.

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2