Fig. 1(a) shows a World War I cannon mounted on a wagon and prepared to fire
a bullet at an angle of 30o
above the horizontal. With the wagon initially at rest on a frictionless horizontal rail
the cannon fires a 200 kg bullet at 125 m/s. (All heats in the rail referential.) (a) The
linear momentum vector of the wagon-truck-bullet system will be the same immediately before and immediately after
the bullet is fired? (b) If the mass of wagon plus gun is equal to 5000 kg, what will be the recoil velocity of the wagon
wagon on the rail after the shot is fired? (c) The bullet rises to a height of 180 m from its trajectory. At this point,
the modulus of its velocity is 80.0 m/s. Based on this information, calculate the amount of thermal energy
produced by the friction of the air with the bullet from the mouth of the gun to its maximum height.
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