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Figure 8-54 shows a World War I cannon mounted on a railcar and set so that it will project a shell at an angle of above the horizontal. With the car initially at rest on a horizontal frictionless track, the cannon fires a 200-kg projectile at . (All values are for the frame of reference of the track.).
The shell is observed to rise to a maximum height of as it moves through its trajectory. At this point, its speed is . On the basis of this information, calculate the amount of thermal energy produced by air friction on the shell from the cannon's mouth to this maximum height.
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