A kayaker needs to paddle north across a 100 -m wideharbor. The tide is going out, creating a tidal current that flowsto the east at 2.0 m/s. The Kayaker can paddle with a speed of3.0m/s.
a. In which direction shoule he paddle in order to travel straightacross the harbor ?
b. How long will it take him to cross ?

a) 48.2 degrees north of west

b) 44.72 s

Explanation:

In order to travel straight across the harbor, his horizontal component velocity must be the same magnitude and opposite direction as the tidal velocity. So it should be 2m/s west ward

a. The direction would be:

cos α = 2/3

north of west

b. His vertical component of velocity would be

So the time it takes for him to cross the 100m river at the rate of 2.24 m/s is

100 / 2.24 = 44.72 s

the moon affects the earth gravitation ally, causing certain motions of that body and also producing tides in its ocean and atmosphere. the tidal wave in our atmosphere is, however, far too minute to be an effective cause in any known meteorological phenomenon.

explanation: