Qualification > Sciences

Physics momentum Question help please

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Deadly_king:

--- Quote from: Garfield on October 10, 2010, 09:37:36 am ---I was looking for astar's post but failed. I tried, I'm not sure but this took me 15 mins only to figure out the entire scene  ::)  :P

a) So perependicular to river's flow. Y component velocity

100X 12sin80+ 200X0= (100+200)v
v=3.94m/s
^^speed to the bank...sidestream
Parallel to river's flow. X component of velocity

100X12cos80+ 200X3= (100+200)v
v= 2.69m/s
^^speed to the waterfall...downstream
b) Time taken to reach the bank= 16/3.94 = approx 4s
    Time taken to reach the falls= 100/2.69=approx 37s

the raft will this reach the bank safely.

I'm not sure. -.-

--- End quote ---

Well.....it seems good to me :)

The last answer was obvious. Hero and heroine always comes out alive :P

nid404:

--- Quote from: Deadly_king on October 10, 2010, 10:31:47 am ---Well.....it seems good to me :)

The last answer was obvious. Hero and heroine always comes out alive :P

--- End quote ---

Looks good...seems good....i...don't...know...if...it....actually...is....the....right....answer :P

HAHAHA.....If it's a bollywood movie...then we can be 100% sure  :P

Deadly_king:

--- Quote from: Garfield on October 10, 2010, 10:34:20 am ---Looks good...seems good....i...don't...know...if...it....actually...is....the....right....answer :P

HAHAHA.....If it's a bollywood movie...then we can be 100% sure  :P

--- End quote ---

Hehe.....don't worry we'll get to know that soon.
If it is the right answer.......then hats off to you :)
If it is not.......then we'll have to find another way to get it ;)

Yeah.........  :D

helai.j:
the b part is correct but A isnt, that answer is attached bellow

elemis:

--- Quote from: helai.j on October 11, 2010, 03:24:05 pm ---the b part is correct but A isnt, that answer is attached bellow

--- End quote ---
LoLzzz  ;D

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