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Jacobpm64
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Homework Statement
A gun on the shore (at sea level) fires a shot at a ship which is heading directly toward the gun at a speed of 40 km/h. At the instant of firing, the distance to the ship is 15,000 m. The muzzle velocity of the shot is 700 m/s. Pretend that there is no air resistance.
(a) What is the required elevation angle for the gun? Assume g = 9.80 m/s^2.
(b) What is the time interval between firing and impact?
Homework Equations
Uhmm, I'm guessing. tflight = [tex]\frac{2v_{0} sin\alpha }{g} [/tex]
Maybe xmax = [tex] \frac{v^{2}_{0}sin2\alpha}{g} [/tex] will also be applicable.
[tex] v_{x} = v_{0x} = v_{0}cos\alpha [/tex]
[tex] v_{z} = v_{0z} - gt = v_{0} sin \alpha - gt [/tex]
[tex] x = v_{0x}t [/tex]
[tex] z = v_{0z}t - \frac{1}{2} gt^2 [/tex]
The Attempt at a Solution
I'm not sure what to do with this problem. Any way I set it up, I end up with more variables than I can solve for.
I would appreciate a hint to throw me in the right direction. Thanks in advance.