Physics Word Problem Help PLEASE!!!!!!!!!?

T

Tyron J

New member
A hunter accidentally fires his rifle into the air at an angle of 29 deg above the horizon. If the speed with which the bullet leaves the gun is 450 m/sec:

A. How far away from the hunter would the bullet strike the ground? (Assume level ground)
B. What is the max. height to which the bullet travels?
C. Determine the final velocity of the bullet, magnitude and angle with respect to the horizontal, at the instant just before it strikes the ground.
D. What is the acceleration of the bullet in the gun barrel if the barrel is 111 cm long? (Assume uniform acceleration within the gun barrel.)
Negligible Air Resistance
 
Parts A-C are answerable with kinematic equations. You'll have to use three points - the point at which the bullet leaves the gun(0), the highest point of its trajectory(1), and the point at which it strikes the ground(2). As we are not given how high above the ground the gun is, we must assume that it leaves the gun at ground level. So you will have the following Knowns:
t0=0
x0=0
y0=0
v0=450 m/s (you will have to separate this into velocity for both the x and y directions)
a in the x direction = 0
a in the y direction = -9.8 m/s/s
t1=?
x1=?
y1=?
v1x=v0x
v1y=0
t2=?
x2=?
y2=?
v2x=v0x
v2y=?

You will probably have to solve for the point it strikes the ground before you can find the highest point of the trajectory.

For part D, it is simple kinematics with 2 points - the point it starts from rest (0) and the point it leaves the gun (1) the angle does not matter. Use the knowns:
t0=0
x0=0
v0=0
a=?
t1=?
x1=111 cm (I'd put this into m)
v1=450 m/s
 
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