2019浙教七年級(jí)下冊(cè)科學(xué)第3章運(yùn)動(dòng)和力第1節(jié)機(jī)械運(yùn)動(dòng)知識(shí)點(diǎn)練習(xí)含含解析四十一

2021浙教版七年級(jí)下冊(cè)科學(xué)[第3章運(yùn)動(dòng)和力第1節(jié)機(jī)械運(yùn)動(dòng)]知識(shí)點(diǎn)練習(xí)[含含解析]四十一2021浙教版七年級(jí)下冊(cè)科學(xué)[第3章運(yùn)動(dòng)和力第1節(jié)機(jī)械運(yùn)動(dòng)]知識(shí)點(diǎn)練習(xí)[含含解析]四十一2021浙教版七年級(jí)下冊(cè)科學(xué)[第3章運(yùn)動(dòng)和力第1節(jié)機(jī)械運(yùn)動(dòng)]知識(shí)點(diǎn)練習(xí)[含含解析]四十一最新教育資料優(yōu)選優(yōu)選2021-2021年浙教版初中七年級(jí)下冊(cè)科學(xué)[第3章運(yùn)動(dòng)和力第1節(jié)機(jī)械運(yùn)動(dòng)]知識(shí)點(diǎn)練習(xí)[含答案解析]四十一第1題【單項(xiàng)選擇題】“騎車的速度比步行的速度快〞，這句話表示( )A、騎車的人經(jīng)過的行程比步行的人經(jīng)過的行程長(zhǎng)B、經(jīng)過的行程相等時(shí)，騎車的人所用的時(shí)間比步行的人多C、在同樣的時(shí)間內(nèi)，騎車的人經(jīng)過的行程比步行的人經(jīng)過的行程長(zhǎng)D、以上說法都不對(duì)【答案】：【解析】：第2題【單項(xiàng)選擇題】人對(duì)著山崖喊話，經(jīng)過2秒聽到回聲，喊話人到山崖的距離是( )A、680米B、340米C、170米D、17米【答案】：【解析】：1/12最新教育資料優(yōu)選第3題【單項(xiàng)選擇題】有一高度為H的田徑運(yùn)發(fā)動(dòng)正在進(jìn)行100米的競(jìng)賽，在終點(diǎn)處，有一站在跑道旁邊的拍照記者用照相機(jī)給他拍攝沖線運(yùn)動(dòng)，拍照記者使用的照相機(jī)的光圈〔控制進(jìn)光量的多少〕是16，快門〔曝光時(shí)間〕是有誤秒，獲取照片后測(cè)得照片中人的高度為h，胸前號(hào)碼布上模糊局部的寬度是有誤，由以上數(shù)據(jù)可以知道運(yùn)發(fā)動(dòng)的( )A、100米成績(jī)B、沖線速度C、100米內(nèi)的均勻速度D、人離照相機(jī)的距離【答案】：【解析】：第4題【填空題】某次跳傘時(shí)，一運(yùn)發(fā)動(dòng)重為600N，湊近地面時(shí)，可以為是豎直向下做勻速直線運(yùn)動(dòng)，當(dāng)運(yùn)發(fā)動(dòng)離地面12m時(shí)速度為3m/s，那么運(yùn)發(fā)動(dòng)此后處落到地面所用的時(shí)間是______s，這12m內(nèi)重力對(duì)運(yùn)發(fā)動(dòng)做的功是______J【答案】：【解析】：2/12最新教育資料優(yōu)選第5題【填空題】小陽利用磁敏電阻為他的自行車設(shè)計(jì)了一個(gè)速度計(jì)，磁鐵固定在自行車的輻條上，磁敏電阻固定在自行車的后車架上，安裝表示圖如圖甲，工作電路如圖乙，電源電壓為6V恒定不變。當(dāng)磁鐵與磁敏電阻Rs靠得近來時(shí)阻值為200Ω，磁鐵與磁敏電阻Rs離得最遠(yuǎn)時(shí)阻值為400Ω，湊近或遠(yuǎn)離時(shí)的實(shí)質(zhì)電阻在這兩者之間變化；當(dāng)R0兩頭電壓不低于4.5V時(shí)電子計(jì)數(shù)器就能有效計(jì)數(shù)，低于4.5V就不可以產(chǎn)生計(jì)數(shù)，車輪每轉(zhuǎn)動(dòng)一圈就計(jì)數(shù)一次。為保證電子計(jì)數(shù)器有效工作，電阻R0最小阻值______Ω。某次行駛中，小明發(fā)現(xiàn)5分鐘恰巧圓滿計(jì)數(shù)了300次，車輪的周長(zhǎng)為3m，那么這段時(shí)間內(nèi)自行車行駛的均勻速度為______km／h。【答案】：【解析】：第6題【填空題】2021年5月21日，我國(guó)成功發(fā)射了“嫦娥四號(hào)〞的中繼衛(wèi)星“鵲橋號(hào)〞，它將成為“嫦娥四號(hào)〞與地球間的“通訊橋梁〞“鵲橋號(hào)〞＂質(zhì)量為448千克，發(fā)射后隨火箭豎直升空1000米的過程中，“鵲橋號(hào)〞需戰(zhàn)勝重力做功______焦。3/12最新教育資料優(yōu)選假定地月間距離為3.8×10^5千米，電磁波速度為3×10^5千米/秒，在月球上發(fā)出的電磁波抵達(dá)地球需______秒?！灿?jì)算結(jié)果保留1位小數(shù)〕如圖是月球反面照片，此中A處是______?！敬鸢浮浚骸窘馕觥浚旱?題【填空題】有一句歌詞：“月亮在白蓮花般的云朵里穿行?〞這類描繪是以______為參照物的．A、云彩【答案】：【解析】：第8題【解答題】飛機(jī)的發(fā)動(dòng)機(jī)是一種熱機(jī)，經(jīng)過航空煤油在氣室中焚燒，從噴口向后高速噴出氣體，使發(fā)動(dòng)機(jī)獲取向前的推力，高空中某飛機(jī)獲取1.6×10^5N的水平推力，以600km/h的速度沿水平方向勻速航行1h，需要完全焚燒熱值為4×10^7J/kg的航空煤油4000kg．求1h內(nèi)：4/12最新教育資料優(yōu)選<!--{cke_protected}{C}%3C!%2D%2D%5Bif%20gte%20mso%209%5D%3E%3Cxml%3E%0A%20%3Cw%3AWordDocument%3E%0A%20%20%3Cw%3AView%3ENormal%3C%2Fw%3AView%3E%0A%20%20%3Cw%3AZoom%3E0%3C%2Fw%3AZoom%3E%0A%20%20%3Cw%3APunctuationKerning%3E%3C%2Fw%3APunctuationKerning%3E%0A%20%20%3Cw%3ADrawingGridVerticalSpacing%3E7.8%20%E7%A3%85%3C%2Fw%3ADrawingGridVerticalSpacing%3E%0A%20%20%3Cw%3ADisplayHorizontalDrawingGridEvery%3E0%3C%2Fw%3ADisplayHorizontalDrawingGridEvery%3E%0A%20%20%3Cw%3ADisplayVerticalDrawingGridEvery%3E2%3C%2Fw%3ADisplayVerticalDrawingGridEvery%3E%0A%20%20%3Cw%3AValidateAgainstSchemas%3E%3C%2Fw%3AValidateAgainstSchemas%3E%0A%20%20%3Cw%3ASaveIfXMLInvalid%3Efalse%3C%2Fw%3ASaveIfXMLInvalid%3E%0A%20%20%3Cw%3AIgnoreMixedContent%3Efalse%3C%2Fw%3AIgnoreMixedContent%3E%0A%20%20%3Cw%3AAlwaysShowPlaceholderText%3Efalse%3C%2Fw%3AAlwaysShowPlaceholderText%3E%0A%20%20%3Cw%3ACompatibility%3E%0A%20%20%20%3Cw%3ASpaceForUL%3E%3C%2Fw%3ASpaceForUL%3E%0A%20%20%20%3Cw%3ABalanceSingleByteDoubleByteWidth%3E%3C%2Fw%3ABalanceSingleByteDoubleByteWidth%3E%0A%20%20%20%3Cw%3ADoNotLeaveBackslashAlone%3E%3C%2Fw%3ADoNotLeaveBackslashAlone%3E%0A%20%20%20%3Cw%3AULTrailSpace%3E%3C%2Fw%3AULTrailSpace%3E%0A%20%20%20%3Cw%3ADoNotExpandShiftReturn%3E%3C%2Fw%3ADoNotExpandShiftReturn%3E%0A%20%20%20%3Cw%3AAdjustLineHeightInTable%3E%3C%2Fw%3AAdjustLineHeightInTable%3E%0A%20%20%20%3Cw%3ABreakWrappedTables%3E%3C%2Fw%3ABreakWrappedTables%3E%0A%20%20%20%3Cw%3ASnapToGridInCell%3E%3C%2Fw%3ASnapToGridInCell%3E%0A%20%20%20%3Cw%3AWrapTextWithPunct%3E%3C%2Fw%3AWrapTextWithPunct%3E%0A%20%20%20%3Cw%3AUseAsianBreakRules%3E%3C%2Fw%3AUseAsianBreakRules%3E%0A%20%20%20%3Cw%3ADontGrowAutofit%3E%3C%2Fw%3ADontGrowAutofit%3E%0A%20%20%20%3Cw%3AUseFELayout%3E%3C%2Fw%3AUseFELayout%3E%0A%20%20%3C%2Fw%3ACompatibility%3E%0A%20%20%3Cw%3ADoNotOptimizeForBrowser%3E%3C%2Fw%3ADoNotOptimizeForBrowser%3E%0A%20%3C%2Fw%3AWordDocument%3E%0A%3C%2Fxml%3E%3C!%5Bendif%5D%2D%2D%3E--><!--{cke_protected}{C}%3C!%2D%2D%5Bif%20gte%20mso%209%5D%3E%3Cxml%3E%0A%20%3Cw%3ALatentStyles%20DefLockedState%3D%22false%22%20LatentStyleCount%3D%22156%22%3E%0A%20%3C%2Fw%3ALatentStyles%3E%0A%3C%2Fxml%3E%3C!%5Bendif%5D%2D%2D%3E--><!--{cke_protected}{C}%3C!%2D%2D%5Bif%20gte%20mso%2021%5D%3E%0A%3Cstyle%3E%0A%20%2F*%20Style%20Definitions%20*%2F%0A%20table.MsoNormalTable%0A%09%7Bmso-style-name%3A%E6%99%AE%E9%80%9A%E8%A1%A8%E6%A0%BC%3B%0A%09mso-tstyle-rowband-size%3A0%3B%0A%09mso-tstyle-colband-size%3A0%3B%0A%09mso-style-noshow%3Ayes%3B%0A%09mso-style-parent%3A%22%22%3B%0A%09mso-padding-alt%3A0cm%205.4pt%200cm%205.4pt%3B%0A%09mso-para-margin%3A0cm%3B%0A%09mso-para-margin-bottom%3A.0001pt%3B%0A%09mso-pagination%3Awidow-orphan%3B%0A%09font-size%3A10.0pt%3B%0A%09font-family%3A%22Times%20New%20Roman%22%3B%0A%09mso-fareast-font-family%3A%22Times%20New%20Roman%22%3B%0A%09mso-ansi-language%3A%230400%3B%0A%09mso-fareast-language%3A%230400%3B%0A%09mso-bidi-language%3A%230400%3B%7D%0A%3C%2Fstyle%3E%0A%3C!%5Bendif%5D%2D%2D%3E-->飛機(jī)的航程；<!--{cke_protected}{C}%3C!%2D%2D%5Bif%20gte%20mso%209%5D%3E%3Cxml%3E%0A%20%3Cw%3AWordDocument%3E%0A%20%20%3Cw%3AView%3ENormal%3C%2Fw%3AView%3E%0A%20%20%3Cw%3AZoom%3E0%3C%2Fw%3AZoom%3E%0A%20%20%3Cw%3APunctuationKerning%3E%3C%2Fw%3APunctuationKerning%3E%0A%20%20%3Cw%3ADrawingGridVerticalSpacing%3E7.8%20%E7%A3%85%3C%2Fw%3ADrawingGridVerticalSpacing%3E%0A%20%20%3Cw%3ADisplayHorizontalDrawingGridEvery%3E0%3C%2Fw%3ADisplayHorizontalDrawingGridEvery%3E%0A%20%20%3Cw%3ADisplayVerticalDrawingGridEvery%3E2%3C%2Fw%3ADisplayVerticalDrawingGridEvery%3E%0A%20%20%3Cw%3AValidateAgainstSchemas%3E%3C%2Fw%3AValidateAgainstSchemas%3E%0A%20%25/12最新教育資料優(yōu)選0%3Cw%3ASaveIfXMLIn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