2. Which of the following is equivalent to 30 km/hr ? A. 8.3 m/s
B. 108 m/s
C. 50 mph
D. 270 km/s

Asmall object with mass 0.200 kg swings back and forth on the lower end of a light rope that is 3.00 m long. the upper end of the rope is attached to the ceiling. as the object swings through its lowest position, where the rope is vertical, the speed of the object is 5.80 m/s. at this point in the motion, what is the tension in the rope? (use g = 9.80 m/s2.)

Adolphin emits ultrasound at 100khz and uses the timing of reflections to determine the position of objects in the water. part a what is the wavelength of this ultrasound? assume that temperature of water is 20 degrees c. answer in cm

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?