. Problems in physics. Derived from military situations and experience . is by no means negli-gible and an excellent opportunity is afforded for a comparison ofactual experience with that which would result from vacuum con-ditions. In order to make this possible, an abridged Range Table,based on tests at the Aberdeen Proving Ground, is provided onpage 28. PROBLEMS 1. A 3-inch trench mortar is trained upon a machine-gun emplace- ment 300 yards away. The elevation is 45 degrees and theazimuth is correct. How near will the shell come to thetarget if the charge consists of a cartridge alone ? Comp
. Problems in physics. Derived from military situations and experience . is by no means negli-gible and an excellent opportunity is afforded for a comparison ofactual experience with that which would result from vacuum con-ditions. In order to make this possible, an abridged Range Table,based on tests at the Aberdeen Proving Ground, is provided onpage 28. PROBLEMS 1. A 3-inch trench mortar is trained upon a machine-gun emplace- ment 300 yards away. The elevation is 45 degrees and theazimuth is correct. How near will the shell come to thetarget if the charge consists of a cartridge alone ? Computefor vacuum conditions and compare your results with theactual range shown in the range table. 2. The elevation of the mortar is changed to 59 degrees. Com- pute the distance by which the shell will miss the target. 3. Find by computation whether a hit would be scored with an elevation of 45 degrees if the emplacement were 100 feetabove the level of the mortar. 4. What is the maximum range in vacuo that can be secured with the cartridge alone? What is the elevation?. THE 3-INCH TRENCH MORTAR 13 5. An enemy trench is 400 yards away. Can it be successfully shelled using a charge consisting of a cartridge and onepowder ring? What will be the angle of elevation (invacuo) ? Compare with the actual range and elevation. 6. When soldiers are instructed to throw hand grenades at the angle which gives maximum range, what angle is specified? 7. An enemy tank is observed 400 yards away. It is advancing at a speed of 6 miles per hour. Assume a muzzle velocity of259 feet per second and vacuum conditions. (a) What will be the time of flight of the shell? (b) How far will the tank have moved during the flightof the shell? (c) What is the correct angle of elevation? 8. An enemy tank is observed 300 yards away. It is making off at a speed of 6 miles per hour in a direction perpendicularto the line of sight. At what angle in advance of the tankmust the mortar be aimed? Assume a muzzle velocity
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