An important news announcement is transmitted by radio waves to people who are 51 km away, sitting next to their radios, and by sound waves to people sitting across the newsroom, 3.6 m from the newscaster. Take the speed of sound in air to be 348 m/s. What is the difference in time that the message is received

In what direction does the medium move relative to the direction of the wave? explain.

The rigid beam is supported by the three suspender bars. bars ab and ef are made of aluminum and bar cd is made of steel. if each bar has a cross-sectional area of 450 mm2, determine the maximum value of p if the allowable stress is (σallow)st = 200 mpa for the steel and ( σallow)al = 150 mpa for the aluminum. est = 200 gpa and eal = 70 gpa.

Which statement correctly describes the relationship between frequency and wavelength?