Air pressure decreases at a rate of 2.5 pascals per kilometer in the eastward direction. in addition, the air pressure is increasing at a constant rate with respect to time everywhere. a ship sailing eastward at 8 km/hour past an island takes barometer readings and records a pressure drop of 30 pascals in 2 hours. estimate the time rate of change of air pressure on the island. (a pascal is a unit of air pressure.)

5 Pa/h

Explanation:

The problem tell us that as air pressure decreases with distance, it also increases with time at a constant rate. Therefore, we have to determine in first place, what would be the decrease of air pressure due to distance:

d: total route of the ship in 2 hours

D: total decrease of pressure due to distance in 2 hours

However, the problem states that the barometer records a pressure drop of 30 pascals in 2 hours. That means, that the rate of air pressure increase due to air, could be determined as follows:

R: time rate of change of air pressure

Then, despite the decrease of air pressure due to distance, the increase due to time makes lower the drop.

b.transmitters send radio waves, and receivers capture radio waves.

hi there!

out of the two, (b) precision would be more reasonable.   however, both a and b could be pretty reasonable.

-awesomerepublic   : )