Select the three sports that do not require beginners to have a high level of fitness

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.

A100 kg running back runs at 5m/s into a stationary linebacker. it takes 0.5 for the running back to be completely stopped

An isotope undergoes radioactive decay by emitting radiation that has a –1 charge. what other characteristic does the radiation have?