- #1
BertsGarage
- 2
- 0
Homework Statement
an athlete releases a shot at an angle of 20 degrees and velocity of 16m/s.
What are the velocity and acceleration of the shot in terms of normal and tangential components when it is at the highest point of its trajectory?
What is the instantaneous radius of curvature of the shot's path when it is at the highest point of its trajectory?
Homework Equations
v = v*et = ds/dt*et
a = at*et + an*en
where at = dv/dt and an = v*dtheta/dt = v^2/rho
rho = (1 + (dy/dx)^2)^3/2 / |d^2y/dx^2|
The Attempt at a Solution
I'm having a hard time with understanding how to express the velocity and acceleration in terms of normal and tangential components...Is there even a normal component to velocity?This is what I'm thinking...When the shot reaches the highest point of its trajectory, the normal velocity would be 0m/s and its normal acceleration would be -9.8m/s^2. The tangential acceleration would be 0m/s^2 which would leave only the tangential velocity to be calculated... I calculated vt = vo*et = 16m/s*(cos20+sin20) = 20.5m/s. For the instantaneous rate of curvature rho = v^2/an = 20.5m/s / -9.8m/s^2 = -2.09m, which doesn't make any sense. Any help would be greatly appreciated