3.92s
Ultrasound works by the waves traveling to the object, bouncing off, then returning. So the distance traveled is twice that of the actual distance.
Therefore d=6,000m
d= speed x time
Speed of sound in water is about 1,530.
6000 = 1530 * t
t = 3.92s
Sandstone can be classified as sedimentary rock. Hope this helps :) If you have any more questions I'm happy to try and help.
Nope. It's called 'centripetal' acceleration. The force that created it MAY be gravitational, but it doesn't have to be. For things on the surface of the Earth moving in circles, it's never gravity.
formula for wavelength = speed/frequency
So 1500/200 = 7.5 meters
