A drum is struck first with little energy. The drum is then struck with a lot of energy. Which sound will be louder? Why?

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.

(1 point) match the differential equations and their vector valued function solutions. you may wish to multiply at least one solution out fully, to make sure that you know how to do it. you can get the other answers quickly by process of elimination and just multiply out one row element.

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration