Acompound machine is also called a machine. a. force b. simple c. complex d. directional

Why are some galaxies’ spectra blueshifted rather than redshifted? question 4 options:

The density of a liquid could be found by using

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.