- #1
annjolino
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Homework Statement
throws a small rock at a beehive from the ground at an angle θ above the horizontal. throws it at velocity v. the rock strikes the beehive just as it reaches the top of its trajectory.
a)ignoring air resistance, what is the speed with which the rock hits thee beehive
b)calculate the speed v=18.0ms-1 θ=55*
c) how high is the beehive
Homework Equations
Vy=1/2gt
Vx?
The Attempt at a Solution
ok i got the time it took to reach its max height was
18.0ms-1/9.8ms-1=1.8s
not sure if that was right equation but it looks like the right answer
a) the Vy at the top of trajectory would equal 0 due to the downward acceleration of gravity
and the Vx i am not sure on.
b)i tried to use trig in a way to solve for just the equation and i got this
i started with finding out the distance traveled along the rocks path
d=1/2gt^2
d=1/2(9.8ms-1)(1.8s^2)
d=15.88m
i then factored in the angle
55*=cos(x/15.88m)
x=cos55*(15.88)
x=9.11ms-1
i don't know if this is right..
the height i think may actually be what i calculated for a) 15.88m