A seagull can fly with a speed of 12.5 m/s (relative to the air). (a) How long will it take the gull to fly from his perch 420. m east to the carcass of a dead fish floating in the water if the wind is from the east at a speed of 2.70 m/s? (b) Having eaten lunch (nicely aged, thank you!) the seagull returns to his perch. How long will the trip take? (c) How long would the round trip have taken if there had been no wind?
a. d = V*T = 420 m.
(12.5-2.70) * T1 = 420
T1 = 420/(12.5-2.70) = 42.9 s.
b. T2 = 420/(12.5+2.7) = 27.6 s.
T = T1+T2 = 42.9 + 27.6 = 70.5 s.
c. T1 = 420/12.5 = 33.6 s.
T2 = T1 = 33.6 s.
T = 33.6 + 33.6 = 67.2 s.