[情報] 普物作業第二彈 第二中譯版

[gn02254995 (毛毛)]

1.
An elevator cab is pulled upward by a cable. The cab and its single occupant
have a combined mass of 2000 kg. When that occupant drop a coin, its
acceleration relative to the cab is 8.00 m/s^2 downward. What is the tension
in the cable?

一個電梯間由纜繩拉扯向上。電梯重2000 公斤。當同高度落下一枚硬幣, 它相對於電梯的
加速度是8.00 m/s^2 向下。
請問在纜繩上的張力?

2.
A 1000 kg boat is traveling at 90 km/h when its engine is shut off. The
magnitude of the frictional force fk between boat and water is proportional
to the speed v of the boat, fk=70v, where v is in m/s and fk is in newtons.
Find the time required for the boat to slow to 45km/h.

一艘1000 公斤小船行進，在90 km/h 時它的引擎被關閉。動摩擦力fk與速度v 的關係是
, fk =70 v, v 的單位是m/s ，fk 的單位是牛頓。
問小船減慢為45km/h 所需的時間。

3.
A boy is initially seated on the top of a hemispherical ice mound of radius
R=13.8m. He begins to slide down the ice, with a negligible initial speed.
Approximate the ice as being frictionless. At what height does the boy lose
contact with the ice?

男孩坐在半徑R=13.8m一個半球形的冰土墩的點頂。他以微不足道的速度開始向下滑。冰
面近似無磨擦力的。
在什麼高度男孩會離開冰面?

4.
A particle is subjected to a force F=4i^+2xj^, where the force is measured in
newtons and the distance in meters.

(a)
Calculate the work done by this force as the particle moves from theorigin to
the point x=1m, y=1m along the straight-line path.

(b)
Calculate the work done by this force if the particle moves from the point
x=1m, y=1m, to the origin along the path consisting of a horizontal and a
vertical segment. Is the force conservative?

一個質點對力量的關係方程式為F=4.i^+2xj^ ，力量與距離的測量單位為牛頓和公尺(米)
。
(a) 計算質點，從原點直線移向點x=1m, y=1m的功。
(b) 計算質點，從點x=1m, y=1m, 向原點移動，此力包括水平和垂直所做的功。請問此力
是否為保守力?


===============================分隔線======================================
有夠累...
花了我一個下午的時間= =
最後一題(b)感覺還是不太對
幫我看吧
映澄...
解題吧!!!

--
我...
只是個平凡的"賤民"...
什麼都嫩、什麼都不能看、因為我是智障!!
┐(─_─)┌

--
推 Calaglin:啊!!??
→ gn02254995:你阿什麼...去解吧!!!
推 linjrming:第一題完全不懂 囧
→ gn02254995:這樣翻看的懂吧!!
推 linjrming:我是說題目看不懂...為什麼相對加速度會是8
→ gn02254995:不知道呢...= =題目這樣寫...
→ miyuika:感謝黃隊長~~
推 Calaglin:書映 第四題(a) 好像是要求功喔 不是力量..
→ Calaglin:而第四題(b) 大概是是要求功 以及 論述其是否為保守力
推 Calaglin:這題的(b)比較麻煩 我寫完再一起PO 我離散還沒搞定呢!!
推 drzero33:我已經想等你們連答案一起PO完再寫了.....
→ gn02254995:對喔...我搞笑...忘記work的意思= =
最後編輯...11/12 15:50

※ 編輯: gn02254995      來自: 124.8.69.131         (11/12 15:50)
→ likeconan:那個第2題答案全部都是數字嗎?我怎麼有一個文字ㄇㄧㄩ
→ KESthecallin:這是什ㄇㄚ..好有FU喔....
→ gn02254995:應該是只有數字吧...映澄...解答殺過來!!!
→ linjrming:樓樓上在FU什麼?難道...XD
→ linjrming:第2題我用能量守衡下去算
→ linjrming:算出來是全數字不知道對不對
推 likeconan:fk=70V像v的那個應該不是速度,是頻率的符號ㄇㄧㄨ吧?
推 bolue:應該是V沒錯
推 Calaglin:為什麼會有ν呢　還有這個不念ㄇㄧㄨ這個字跟new同音..
→ Calaglin:ㄇㄧㄨ是這個μ
推 bolue:他以為是摩擦係數......大帝了了嗎?