What type of changes does erosion cause? a physical b chemical c electrical d magnetic

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.

If the wheels lock when braking suddenly the vehicle: a: loses traction b: lose steering wheel ability c: gain speed slightly d: gain steering ability

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.