Asked by jzee11
Draw a diagram to scale showing the direction in which a man must row across a river in order to reach a point directly opposite, if he rows 3 mile/hr while the speed of current is 2 mile/hr.
My ans- with angle of 33' with straight line he wants to travel. And V=3.6 mile/hr.
Now if the river is 1/4 mile broad, how long does it take to cross it and what is the velocity of the boat relative to the shore.
Is this correct?
ans- 3.6 mile in 1 hr then for 0.25 mile t=4.16 min. And relative velocity is 3.6 mile/hr.
My ans- with angle of 33' with straight line he wants to travel. And V=3.6 mile/hr.
Now if the river is 1/4 mile broad, how long does it take to cross it and what is the velocity of the boat relative to the shore.
Is this correct?
ans- 3.6 mile in 1 hr then for 0.25 mile t=4.16 min. And relative velocity is 3.6 mile/hr.
Answers
Answered by
Damon
3 sin thete = 2
theta = 41.81
V across = 3 cos theta
= 2.24 mi/hr
(1/4)/2.24 = .112 hr = 6.7 minutes
He has zero velocity parallel to the shore (that is the whole point)
However he has speed of 2.24 mi/hr perpendicular to the shore.
theta = 41.81
V across = 3 cos theta
= 2.24 mi/hr
(1/4)/2.24 = .112 hr = 6.7 minutes
He has zero velocity parallel to the shore (that is the whole point)
However he has speed of 2.24 mi/hr perpendicular to the shore.
There are no AI answers yet. The ability to request AI answers is coming soon!
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.