1.A ball is thrown directly upwardswith an initial velocity of 20m/s.Determine the ball’s maximum height and thetime it
1.A ball is thrown directly upwardswith an initial velocity of 20m/s.Determine the ball’s maximum height and thetime it will take for the ball to fall from its maximum height to the ground.(10 marks)
2.A man hauls a 20kg stone thatis currently resting atop a 300 meter cliff up the mountain side to a height of500 meters.He then casts the stone directly downwards until it reaches thevery base of the mountain (0 meters).What is the total work done on the stone?(Hint:work is the change ofenergy!) (10 marks)
2.A man hauls a 20kg stone thatis currently resting atop a 300 meter cliff up the mountain side to a height of500 meters.He then casts the stone directly downwards until it reaches thevery base of the mountain (0 meters).What is the total work done on the stone?(Hint:work is the change ofenergy!) (10 marks)
英語人氣：203 ℃時(shí)間：2019-08-20 17:25:07
優(yōu)質(zhì)解答
1.A ball is thrown directly upwards with an initial velocity of 20m/s.Determine the ball’s maximum height and the time it will take for the ball to fall from its maximum height to the ground.(10 mark...
我來回答
類似推薦
- 光滑水平面上停放著質(zhì)量為m且?guī)в兴姆种粓A周的圓弧形光滑絕緣軌道的小車,另有一質(zhì)量也為m、帶+q電荷的絕緣小球以水平初速度 v.從小車的左端沿弧形軌道沖上小車,整個(gè)區(qū)域有豎直向下的勻強(qiáng)電場(chǎng).則
- 飛機(jī)加速滑行16s速度可達(dá)到80m每秒而起飛升空,如果允許飛機(jī)在達(dá)到起飛速率的瞬間停止起飛,切以大小為a2＝8.0米每二次方秒的恒定加速度減速,為確保飛機(jī)不滑出跑到,求加速滑行的加速度a1 跑到的長(zhǎng)度x至少為多少?
- 如圖所示，虛線表示電場(chǎng)的一族等勢(shì)面且相鄰等勢(shì)面電勢(shì)差相等，一個(gè)帶正電的粒子以一定的初速度進(jìn)入電場(chǎng)后，只在電場(chǎng)力作用下沿實(shí)線軌跡運(yùn)動(dòng)，粒子先后通過M點(diǎn)和N點(diǎn).在這一過程中，
- 在水池中浮著一只木桶，木桶里裝有石塊.若把木桶中的石塊揀出來扔在水池里，則水池的水面將會(huì)（ ?。?A.上升 B.下降 C.不變 D.條件不足，不能確定
- 求物理題答案及解釋
- 梁?jiǎn)⒊岢龅?輿論之母"是指什么?
- 冒高氯酸煙
- 【急!今天10點(diǎn)就要!】一道仿照例句 寫句子的題.
- 6分之5×58＋8分之1×41＋8分之1
- 在三角形ABC中,已知a=2,b=3,c=120°,則sinA的值為 求詳解,急
- 讀《論語》有感
- 1111分之111與11111分之1111那個(gè)大?
猜你喜歡
- 1都有哪些東西可以和速度快或是加快速度有聯(lián)系的（物品,事件,詞語,現(xiàn)象等）希望盡量全面些哦!
- 2英語動(dòng)詞填空what he said _______(record) just now. We can listen to it again.
- 3服裝廠生產(chǎn)襯衫,上半月完成計(jì)劃的45%,下半月比上半月多生產(chǎn)350件,剛好完成任務(wù).
- 4Tim was very______because many friends came to his birthday party.
- 5we moved to Canada in 2008變成否定句
- 6澄清石灰水中加鹽酸的離子方程式是?
- 7I think that it's a useful to learn a foreign-language.
- 8世界上有多少種字典?有多少種查字典的方法?應(yīng)該怎樣查?
- 9如果A>0,B>0,那么A+B>0 的逆命題,是真是假
- 10一個(gè)多邊形除了一個(gè)內(nèi)角外，其余各內(nèi)角之和為1680°，那么這個(gè)多邊形的邊數(shù)為_．
- 11鋁與硫酸鐵反應(yīng)
- 12把下列句子整理成一段通頗的話,在括號(hào)里填上序號(hào).快的加50分~