Question
G1 and G7 are common form factors for these objects. For 10 points each:
[10h] Name these objects, which are often described by their sectional density. The pressure generated by these objects is often measured in copper units of pressure.
ANSWER: bullets [or rounds; or ammunition; or ammo; or cartridges; prompt on guns or firearms or weapons or projectiles]
[10e] Bullets are prototypical examples of these objects, whose motion is studied in external ballistics. The trajectory of these objects is influenced by gravity and air resistance.
ANSWER: projectiles [accept projectile motion]
[10m] The chamber pressure created by a bullet can be cheaply measured with one of these devices, which consist of thin parallel zig-zags of metal foil on an insulating polyimide film. These devices use a Wheatstone bridge to measure a quantity equal to change in resistance over undeformed resistance over a namesake dimensionless factor.
ANSWER: strain gauges
<Chen, Physics>
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