Baseball scouts use a radar gun to measure the speed of pitches. One particular model of radar gun emits a microwave signal at a frequency of 10.525 GHz (GHz = x10^9 Hz). What is the increase in frequency of these waves as seen by a 40.2 m/s fastball headed straight toward the radar gun? (Express your answer in the following format: #.# x 10^# Hz)

Arunner is jogging at a steady 3.6 km/hr. when the runner is 2.9 km from the finish line, a bird begins flying from the runner to the finish line at 14.4 km/hr (4 times as fast as the runner). when the bird reaches the finish line, it turns around and flies back to the runner. even though the bird is a dodo, we will assume that it occupies only one point in space, i.e., a zero-length bird. how far does the bird travel? (b) after this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. the bird repeats the back and forth trips until the runner reaches the finish line. how far does the bird travel from the beginning? (i.e. include the distance traveled to the first encounter)