Water wave traveling in a straight line on a lake is described by the equation y(x, t)=(2.75cm)cos(0.410rad/cmx+6.20rad /st) where y is the displacement perpendicular to the undisturbed surface of the lake.

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.

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?

You can watch static electricity in action by rubbing an inflated balloon against your hair. your hair will actually stand on its end! it does this because each hair becomes charged, and they all repel one another.