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Vector/Projectile Questions

  1. Sep 20, 2009 #1
    1. The problem statement, all variables and given/known data
    A pitcher throws a baseball horizontally from the mound to home plate. the ball falls .809 m by the time it reaches home plate 18.3 m away. how fast was the pitchers pitch?


    2. Relevant equations
    c^2=a^2+b^2


    3. The attempt at a solution
    i drew a picture with .809 as the height (x) and 18.3 as the distance (y) and then used the pythagorean theorem to calculate they hypotenuse which was 18.3 and what i assumed to be the answer.

    1. The problem statement, all variables and given/known data
    A shell is fired from the ground with an initial speed of 1.74 multiplied by 103 m/s at an initial angle of 45° to the horizontal. Neglecting air resistance, find the shell's horizontal range. Find the amount of time the shell is in motion.

    2. Relevant equations
    Vx= vi(cos theta), x=(vi cos theta)(T)--->rearrange to get x/vi(cos theta)=t

    3. The attempt at a solution
    i solved for vx=1740(cos 45)=1230.4 but that was wrong. then i took 1230.4/1740(cos 45) and got 1 s for T which was wrong as well.


    thanks for the help
     
  2. jcsd
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