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A motor boat is rising towards N at 25 Km/hr and the water current in that region is 10 km /hr in the direction of 60° east of south . Find the resultant velocity of the boat .

Physics
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@waterineyes you know this sum ?
I don't...
you know some one in open study who can help me ?

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Other answers:

I think @sauravshakya can help you here..
i sent him a msg .. no reply :/
But he is online.. Let me try..
okay !
Which chapter is this ??
motion in a plane.
Yeah I think you will get help here..
thanks waterineyes :)
@rsadhvika do you know how to solve this ??
|dw:1344771481322:dw|
Here A and B are the vectors.. A is representing the boat and B is representing Water...
okay .. understood !
Now We have to find Resultant first.. For that we first make our figure look like parallelogram..
okay
Wait I draw the figure more clearly for you..
its okay .. i can understand :)
|dw:1344771854805:dw|
|dw:1344771963782:dw|
is that the parellelogram we need ?
Now make it look like parallelogram: |dw:1344771989674:dw| Getting this ??
yeah got it !
Now can you draw diagonal of the parallelogram ??
|dw:1344772085729:dw|
wrong ?
Great.. This is the resultant of A and B vector..
okay :)
what is theta here ?
You must mention the direction also..
what direction ? direction of vector ?
|dw:1344772213529:dw|
okay !
Since boat has higher velocity then boat will go in upward direction.. Getting ??
yeah ..and if lower velocity , down ?
Yeah that will depend upon velocity of water..
okay !
Have you studied about the formula: \[Resultant (R)= \sqrt{A^2 + B^2 + 2AB \cos(\theta)}\]
yeah i have !
Here A is just velocity of boat that is : 25 and B is just velocity of water that is : 10 But you have to find theta first.. Right ??
yeah .. how do we find theta ?
Theta is basically angle between the two vectors A and B.. Here what is the angle between A and B.. Can you locate on the drawing ??
|dw:1344772636899:dw|
i don't know !
|dw:1344772698399:dw|
That is the angle between A and the resultant.. We have to locate angle between A and B..
Don't worry @ashna I draw it..
okay !
|dw:1344772809427:dw| Getting?? That is the angle between A and B..
yeah !
Can you find its value ??
Make a try..
180 - 60 ?
120 ?
Great.. A medal for you..
:)
Can you tell cos(120) = ??
yea .. cos (90+30) - sin 30 - 1/2 correct ?
I wish I could give you more medals.. Yes that is very correct.. Now can you use that formula ??
okay i'll try !
There is no need to go fast.. I can wait.. Just take your time and post your answer here..
I think this site is going to be down soon..
If my reply does not come @ashna then don't worry . Just post the answer or doubt here I will check it later on..
What happened @ashna
okay .. now i can type .. some net problem i guess.. sorry for the delay .. i got square root 475 !
91.7945

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