獨孤 發問時間: 社會與文化語言 · 1 0 年前

一個小小的物理問題..誰能幫我解答.....20點

When a high-speed passenger train traveling at 161 km/h rounds a bend, the engineer

is shocked to see that a locomotive has improperly entered onto the track from a siding and is a distance D=676 m ahead ( Fig. 2-24 ).The locomotive is moving at 29.0 km/h. The engineer of the high-speed train immediately applies the brakes (a) What must be the magnitude of the resulting constant deceleration if a collision is to be just avoided ? (b) Assume that the engineer is at x = 0 when, at t = 0, he first spots the locomotive. Sketch x(t) curves for the locomotive and high-speed train for the cases in which a collision is just avoided and is not quite avoided.

已更新項目:

要用哪一個公式計算才好??

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拜託各位大大

1 個解答

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  • Lv 5
    1 0 年前
    最佳解答

    高速的旅客列車移動的時候,在161公里/h弄圓彎,工程師

    被震驚的到不適當地看見運動的有進入在之上軌跡從袒護和是距離D=676 m預先 ( 數字2-24 ).機車在動在29.0公里/h.這工程師的這高-速率列車馬上關閘 ( 一 ) 什麼必須是這重大的這作為結果的不變的常數減速如果一碰撞將是正好避免?( b ) 假設工程師在x = 什麼時候,在t = 0,他首先認出運動的.略圖x ( t) 曲線去運動的和高速的火車為實例那個碰撞僅僅被避免和不是相當避免.

    差不多是這樣~

    參考資料: Word 網際護照 專業版
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