Q. A cardinal (Richmondena cardinalis) of mass 3.90×10-2 and a baseball of mass 0.144 have the same kinetic energy. What is the ratio of the cardinal's magnitude of momentum to the magnitude of the baseball's momentum?
Q. How fast should a car move toward you for the car's horn to sound 3.0% higher in frequency than when the car is stationary? The speed of sound is 343 m/s. Give your answer to the nearest 0.1 m/s.