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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
 2 years ago
 2 years ago
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
 2 years ago
 2 years ago

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Mani_JhaBest ResponseYou've already chosen the best response.1
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 \[h=u ^{2}\sin ^{2}\theta/2g\]
 2 years ago

saliniBest ResponseYou've already chosen the best response.0
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
 2 years ago

saliniBest ResponseYou've already chosen the best response.0
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
 2 years ago

saliniBest ResponseYou've already chosen the best response.0
dw:1328876734968:dwdw: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 189theta
 2 years ago

saliniBest ResponseYou've already chosen the best response.0
wat is your doubt in this?
 2 years ago

KingBest ResponseYou've already chosen the best response.0
i dont understand wat is the answer and hw u got it?....i only understood the same velocity thing
 2 years ago

KingBest ResponseYou've already chosen the best response.0
and also in the website there are numerical answers but we didn't get any?
 2 years ago

KingBest ResponseYou've already chosen the best response.0
and can u pls xplain with numerics b'cuz i hate variables in physics and dont understand it
 2 years ago

saliniBest ResponseYou've already chosen the best response.0
dw:1328877186942:dw is the question like this or are the bat and ball at the same level?
 2 years ago

KingBest ResponseYou've already chosen the best response.0
no its a parabola same height
 2 years ago

saliniBest ResponseYou've already chosen the best response.0
ok now first draw the diagram with all velocities, distance marked in it with wat u understood
 2 years ago

saliniBest ResponseYou've already chosen the best response.0
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
 2 years ago

KingBest ResponseYou've already chosen the best response.0
ok...can u teach me hw to write in terms of components?
 2 years ago

saliniBest ResponseYou've already chosen the best response.0
dw:1328877872806:dw give me the values for vx and vy
 2 years ago

KingBest ResponseYou've already chosen the best response.0
is it 2cos30 or 20cos30 i cant understand..if u tell me that i will calculate the value
 2 years ago

KingBest ResponseYou've already chosen the best response.0
i meant it looked like 2cos30
 2 years ago

saliniBest ResponseYou've already chosen the best response.0
dw:1328878380008:dwwhere i and j are direction along x and y axis and are mutually perpendicular to one another
 2 years ago

KingBest ResponseYou've already chosen the best response.0
do u hav to use i cap and j cap?
 2 years ago

saliniBest ResponseYou've already chosen the best response.0
AND THATS HOW U REPRESENT ANY VECTOR YES U HAVE TO TO SPECIFY DIRECTIONS
 2 years ago

KingBest ResponseYou've already chosen the best response.0
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
 2 years ago

saliniBest ResponseYou've already chosen the best response.0
no I turned the capslock when i answered arvind
 2 years ago

KingBest ResponseYou've already chosen the best response.0
sry salini i shall try frm here on my own...rite nw i gtg!
 2 years ago
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