Ariver flows with a speed of 0.600 m/s. a student first swims upriver 0.500 km, then turns around and returns to his starting point. the student swims at a constant speed of 1.20 m/s relative to the water. (a) how long does the round trip in the river take? (b) how long would a trip of the same length take in still water? (c) explain why it takes longer to swim in moving water, considering that it takes longer to swim upriver but shorter to swim downriver.

a) 1111.0 seconds

b) 833.3 s

c) Because of proportions

Explanation:

a) Total time of round trip is the sum of time upriver and time downriver

Time upriver is calculated with the net speed of student and 0.500 km:

(Becareful with units 0.5 km= 500m) Similarly of downriver:

So the sum is:

b) Still water does not affect student speed, so total time would be simply:

c) For the upriver trip, student moved half the distance in half speed of the calculation in b), so it kept the same ratio and therefore, same time. So the aditional time is actually the downriver.  

scientific laws are the result of testing theories and proving them to be facts.

the journeys of marquette, joliet and la salle a) new france expand.

all three of these explorers explored the midwest and the area around the great lakes, which they subsequently claimed for france.

this was a big portion of territory and expanded new france which before then only consisted of quebec province in northeastern canada