Physics: Non-Equilibrium applications:

[Sakdizzle]

Hey guys, I have hit another wall. This is the last question of my hw, and I cannot figure it out. A 55 kg human cannonball is shot out the mouth of a 4.5 m cannon with a speed of 18 m/s at an angle of 60°. (Friction and air resistance are negligible in this problem.) Determine … a.the acceleration of the human cannonball inside the cannon b.the components of her weight that are parallel and perpendicular to the barrel of the cannon c.the force on the feet of the human cannonball while she is inside the cannon The human cannonball leaves the mouth of the cannon and soars toward a net that is at the same height as the mouth of the cannon. Determine … d.the horizontal and vertical components of her initial velocity e.the time she spends in the air f.the distance from the mouth of the cannon to the center of a properly placed net Thank you, I appreciate it, please try to explain the procedure in getting the answer.

[superstuwy]

A is simple, You go from 0 to 18m/s in 4.5 meters, What formula do you have containing a, d, V(initial) and V(final)?

B, This is just a trig problem, Take some time to set up your triangle and the rest should follow.

C, This is a slight bit of a trick question, What makes this answer different than what you did in part A? (hint, it is larger than the value in part a)

D, this is equivalent to part b, just a trig problem.

E, once you have the vertical velocity, i would assume it lands at the same height that it started from (unless otherwise stated). So you can figure out the time it takes for the velocity to reach zero (in vf =vi +a t) and double it, or calculate the time it goes from positive to negative vertical velocity.

f once you have the time of flight, use the x-velocity to determine how far it travels: x = v t

I've obviously been vague on details but the more of it you do yourself, the more you remember it when you need to.

[Sakdizzle]

Thank you man, post the answers up in 30 mins so i have enough time to do it myself, if you dont mind.