1) An oceanic depth-sounding vessel surveys the ocean bottom with ultrasonic wav

Question

1) An oceanic depth-sounding vessel surveys the
ocean bottom with ultrasonic waves that
travel 1530 m/s in seawater.
How deep is the water directly below the
vessel if the time delay of the echo to the
ocean ?oor and back is 7 s?
Answer in units of m

2) A student throws a baseball at a large gong
74 m away and hears the sound of the gong
2.12168 s later. The speed of sound in air is
330 m/s.
What was the average speed of the baseball on its way to the gong? (For simplicity,
assume its trajectory to be a straight line.)
Answer in units of m/s

3) A vehicle moves in a straight line with an
acceleration of 8 km/h
2.
By how much does the speed change each
second?
Answer in units of km/h

Explanation / Answer

1) (1530 m/s * 7s)/2 = 109.28 m

You divide by 2 because its two-way-time, and you only want one-way-time.

2) distance traveled = 74
time taken to travel = 2.12168/2
average speed = 74/2.12168/2 =69.75 m/s

3 ) v = a*t
= 8 km/hr2 * 1 sec = 8km/hr2 * 1/3600 hr

2.222*10-3 km/hr

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