[問題] 普物 electromagnetic rail gun

看板Physics作者PhysiAndMath (老師說要愛數學)時間15年前 (2010/08/25 18:47)推噓7(7推 0噓 11→)

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An idealized schematic of an "electromagnetic rail gun", which is designed to fire prejectiles at speeds up to 10km/s. The projectile P sits between and in contact with two parallel rails along which it can slide. A generator G provides a current that flows up one rail, across the projectile, and back down the other rail. ┌───────────────────┐ →→│ i → │ ↑ └─────────┬─┬───────┘┬ ↑ │i │ v │ G │↓│P → │ w ↓ │ │ │ ↓ ┌─────────┴─┴───────┐┴ →→│ ← i │ └───────────────────┘ ├───────────────────┤ L (a) Lat w be the distance between the rails, r the radius of the rails (presumed circular), and i the current. Show that the force on the projectile is to the right and given approximately by 1 iiμ w+r F = ─ ── ㏑─── 2 π r (b) If the projectile starts from the left end of the rail at rest find the speed v at which it is expelled at the right. 我看不懂他r的描述到底是什麼由於我是自修普物可以的話麻煩回答詳細一點... btw 我想知道如何"正確的"回答物理題目... 很多要按計算機的題目讓數學系出身的我很痛苦... 想順便請教一下各位前輩使用''使用計算機的訣竅'' 題目出自 Physics - Halliday‧Resnick‧Krane - fifth edition ---- p.770 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 59.116.5.250

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nightkid

08/25 19:28, , 1^F

08/25 19:28, 1^F

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nightkid

08/25 19:35, , 2^F

08/25 19:35, 2^F

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PhysiAndMath

08/25 19:44, , 3^F

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