Write any two important of gravitational force?

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.

Astudent pushes a 60-n block across the floor for a distance of 10 m. how much work was done to move the block

Which describes increasing the efficiency of energy resource