King
  • King
A baseball player hits a homerun, and the ball lands in the left field seats, which is 120 m away from the point at which the ball was hit. The ball lands with a velocity of 20 m/s at an angle of 30 degrees below horizontal. Ignoring air resistance (A) find the initial velocity and the angle above horizontal with which the ball leaves the bat; (B) find the height of the ball relatively to the ground
Physics
chestercat
  • chestercat
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Mani_Jha
  • Mani_Jha
If there is no air resistance, the parabolic path will be symmetrical, and thus it will land at the same velocity with which it left. So \[u=20 m/s and \theta=30\] The height will be \[h=u ^{2}\sin ^{2}\theta/2g\]
anonymous
  • anonymous
it is like that concept in which when u fire a bullet vertically up,it comes down same straight line to hit u with same speed with which it went if not for air drag
anonymous
  • anonymous
there is a common principle that when a body is thrown up from a certain height,then when it comes back to the same height, it will have the same velocity

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anonymous
  • anonymous
|dw:1328876734968:dw||dw:1328876550335:dw| sincew the magnitude of velocity is same however when u see the angle made with the horizontal,first it is theta and next it is 189-theta
anonymous
  • anonymous
sorry 180-theta*
King
  • King
ya so ?
anonymous
  • anonymous
wat is your doubt in this?
King
  • King
i dont understand wat is the answer and hw u got it?....i only understood the same velocity thing
King
  • King
and also in the website there are numerical answers but we didn't get any?
King
  • King
and can u pls xplain with numerics b'cuz i hate variables in physics and dont understand it
anonymous
  • anonymous
|dw:1328877186942:dw| is the question like this or are the bat and ball at the same level?
King
  • King
no its a parabola same height
King
  • King
|dw:1328877374070:dw|
anonymous
  • anonymous
ok now first draw the diagram with all velocities, distance marked in it with wat u understood
King
  • King
|dw:1328877495107:dw|
anonymous
  • anonymous
in A portion,they ask for angle made with horizontal which is 30 as i explained and the magnitude of velocity is same 20m/s dont bother about the direction being different as when we say that a vector has magnitude and direction, we mean to say that we can write it in terms of i^ j^ k^ anyway my magnitude of velocity remains the same if u want to write that velocity in terms of components i can teach u how to do it the u get a solid vector notation of the velocity when ball leaves bat
King
  • King
ok...can u teach me hw to write in terms of components?
anonymous
  • anonymous
|dw:1328877872806:dw| give me the values for vx and vy
King
  • King
vy=2cos30 or 20cos30?
King
  • King
salini?
anonymous
  • anonymous
value
King
  • King
is it 2cos30 or 20cos30 i cant understand..if u tell me that i will calculate the value
anonymous
  • anonymous
20*root3/2 and 20*1/2
King
  • King
i meant it looked like 2cos30
King
  • King
it is 10sqrt3 and 10
anonymous
  • anonymous
|dw:1328878380008:dw|where i and j are direction along x and y axis and are mutually perpendicular to one another
King
  • King
do u hav to use i cap and j cap?
anonymous
  • anonymous
AND THATS HOW U REPRESENT ANY VECTOR YES U HAVE TO TO SPECIFY DIRECTIONS
King
  • King
hey why u gettin angry?i am not ud at those and we hav to find only magnitude anyways..if u are irritated and dont wanna explain its fine
King
  • King
*gud
anonymous
  • anonymous
no I turned the capslock when i answered arvind
King
  • King
oh!sry!
King
  • King
sry salini i shall try frm here on my own...rite nw i gtg!

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