題中說(shuō)如圖所示 沒(méi)圖啊..大概翻譯下:過(guò)程自己翻譯過(guò)去吧
1.一個(gè)質(zhì)量為5Kg的物體靜止放在光滑的水平面上,通過(guò)細(xì)繩和滑輪與一10Kg的懸垂的物體相連,如圖所示.求兩個(gè)物體的加速度和細(xì)繩所受的張力.
設(shè)繩子所受張力為F,g的值取10 根據(jù)兩物體加速度時(shí)時(shí)相等列等式
可得F=33.3N(100/3) a=6.7m/s2(20/3)
2.一個(gè)棒球被擊打,球恰好越過(guò)一座3m高的墻壁,離起點(diǎn)130m.球的初速度與水平面成35度角,擊球點(diǎn)離地面1m.求球的初速度.
(這題有點(diǎn)疑問(wèn),是130m嗎 還是13m啊 確定是35度嗎 應(yīng)該是特殊角吧30或45)
3.棒球投手以42m/s的速度水平地投球,球在越過(guò)18.3m遠(yuǎn)外的墻之前落在多遠(yuǎn)處
落下
（可能我的理解有問(wèn)題,before crossing the plate,which is 18.3m away這個(gè)條件不知怎么用）
AP Phyics物理
AP Phyics物理
1)A 5-kg mass resting on a smooth horizontal table is connected to a cable which passes over a pulley and then is fastened to a hanging 10-kg mass as shown.Find the acceleration of the two objects and the tension in the string.
2)A baseball is hit in such a way that the ball just clears a wall 3m tall,130m from home plate.The ball leaves at an angle of 35 degrees to the horizontal and 1m above the ground.Find its initial velocity.
3) A baseball pitcher throws a fastball horizontally at 42.m/s.How far does it drop before crossing the plate,which is 18.3m away?
1)A 5-kg mass resting on a smooth horizontal table is connected to a cable which passes over a pulley and then is fastened to a hanging 10-kg mass as shown.Find the acceleration of the two objects and the tension in the string.
2)A baseball is hit in such a way that the ball just clears a wall 3m tall,130m from home plate.The ball leaves at an angle of 35 degrees to the horizontal and 1m above the ground.Find its initial velocity.
3) A baseball pitcher throws a fastball horizontally at 42.m/s.How far does it drop before crossing the plate,which is 18.3m away?
英語(yǔ)人氣：555 ℃時(shí)間：2020-06-05 01:47:40
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