23.(9分)在一条笔来自直的公路上有A、B两地360问答,它们相距150千决概跟掌福呀米,甲、乙两部巡警车分别从A、B两地同时出发,沿公路匀速相向而行,分别驶往B
题目不完整吧?
在一条笔直的公来自路上有AB两地,他们相距150KM,甲乙两部巡警车分别从AB两360问答地同时出发,沿公里匀速相向而行,
(1)因为距离是越来越近的所以距离是150-(70+80)X当然这里X<1题目说了问评江管现界序边处府侵压的是两车相遇之前(2)LZ这种题建议你画一下图其实很简单就是要理解题目其...
展开阅读全文 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAG1BMVEUAAABuk71wj79vkr1wj79wn79vlL1vk75vk73EmhGbAAAACHRSTlMA0BDfIBDfv/U9wHQAAABISURBVBjTY6AlYBOC0OEJQIK9UQHEZpUQAJJMEmCpQIiYIohiBQlBpKASUCmwBETKQiiw2QFmunOjhAncKhYLkARcCihBWwAA5n0JqdkCrS4AAAAASUVORK5CYII=)
收起 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAHlBMVEUAAABuk71wj79vlL1wl79wn79vkr1vlL5vk75vk71klGr6AAAACXRSTlMA0BDfIBDfv7/eQcl1AAAARklEQVQY02OgNXA2QbBZLCc7ICQmSpogJIQUJytAOYETFZgkhSBsVhBDcaICRAJEA6XgEjApRhAJkmoAkmxFEK2KCQw0BAA5Lgp0ywp4owAAAABJRU5ErkJggg==)
在一条笔直来自的公路上,有a,b两地,它们相距150千米,甲乙两部巡警车分别从A,B两地同时出发,沿公路匀速相
15/(80+70)*2=0.2晕,只要是两个人的距离在15千米之内就行了360问答啊从开始间距15到离开时的15就是两个15,即15*2
公路巡来自警开车在高速公路上死士始家房身员地初以100km/h 的恒定速度巡查,在同一车道上巡警车向前方的一辆轿车发360问答出一个已知频
(1)如果巡警车接收到的超第河况万入声波频率比发出时低,由多普勒效应可知,巡警车与轿车在相互远离.又由于巡警车在后且车速恒定,所以轿车的速度大于100km/h.(2)如果巡警车接...
展开阅读全文 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAG1BMVEUAAABuk71wj79vkr1wj79wn79vlL1vk75vk73EmhGbAAAACHRSTlMA0BDfIBDfv/U9wHQAAABISURBVBjTY6AlYBOC0OEJQIK9UQHEZpUQAJJMEmCpQIiYIohiBQlBpKASUCmwBETKQiiw2QFmunOjhAncKhYLkARcCihBWwAA5n0JqdkCrS4AAAAASUVORK5CYII=)
收起 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAHlBMVEUAAABuk71wj79vlL1wl79wn79vkr1vlL5vk75vk71klGr6AAAACXRSTlMA0BDfIBDfv7/eQcl1AAAARklEQVQY02OgNXA2QbBZLCc7ICQmSpogJIQUJytAOYETFZgkhSBsVhBDcaICRAJEA6XgEjApRhAJkmoAkmxFEK2KCQw0BAA5Lgp0ywp4owAAAABJRU5ErkJggg==)
公路巡警开车在高速公路上以100km/h的恒定速度巡查来自,在同一车道上巡警车向前方的一辆轿车发出一个已知频360问答
巡警车六下曾接收到的超声波频率比发出时低,显一起刘免婷践由多普勒效应可知,巡警孙车与轿车在相互远离.又由于掉末谓星任飞静续巡警车在后且车速恒定,所以轿车的速度大于100k危起钱食...
展开阅读全文 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAG1BMVEUAAABuk71wj79vkr1wj79wn79vlL1vk75vk73EmhGbAAAACHRSTlMA0BDfIBDfv/U9wHQAAABISURBVBjTY6AlYBOC0OEJQIK9UQHEZpUQAJJMEmCpQIiYIohiBQlBpKASUCmwBETKQiiw2QFmunOjhAncKhYLkARcCihBWwAA5n0JqdkCrS4AAAAASUVORK5CYII=)
收起 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAHlBMVEUAAABuk71wj79vlL1wl79wn79vkr1vlL5vk75vk71klGr6AAAACXRSTlMA0BDfIBDfv7/eQcl1AAAARklEQVQY02OgNXA2QbBZLCc7ICQmSpogJIQUJytAOYETFZgkhSBsVhBDcaICRAJEA6XgEjApRhAJkmoAkmxFEK2KCQw0BAA5Lgp0ywp4owAAAABJRU5ErkJggg==)
(2011?万州区模拟)公路巡警开车在高速公路上以100Km/h的恒定车速补讨巡查,巡警车向前方同一车道行驶的一辆
根据多普勒效应,相对源(一般是声音发出点)靠近的时候,测量的频率会比实际大,相反会变小.巡警车接收到的频率低了,即观察者接收到的频率低了,说明轿车和巡警车来自在相互远离,而巡警车...
展开阅读全文 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAG1BMVEUAAABuk71wj79vkr1wj79wn79vlL1vk75vk73EmhGbAAAACHRSTlMA0BDfIBDfv/U9wHQAAABISURBVBjTY6AlYBOC0OEJQIK9UQHEZpUQAJJMEmCpQIiYIohiBQlBpKASUCmwBETKQiiw2QFmunOjhAncKhYLkARcCihBWwAA5n0JqdkCrS4AAAAASUVORK5CYII=)
收起 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAHlBMVEUAAABuk71wj79vlL1wl79wn79vkr1vlL5vk75vk71klGr6AAAACXRSTlMA0BDfIBDfv7/eQcl1AAAARklEQVQY02OgNXA2QbBZLCc7ICQmSpogJIQUJytAOYETFZgkhSBsVhBDcaICRAJEA6XgEjApRhAJkmoAkmxFEK2KCQw0BAA5Lgp0ywp4owAAAABJRU5ErkJggg==)
巡警车在高速公路上以100 km/h的恒定速度行驶.巡警车向价在同一车道正前方同向行驶苏做孔阶的一辆轿车发出一定频率的超声波,该超声波被那辆轿车反射回来,若巡来自警车接收到的反射回来的超声波频率比发射的超声波频率低,则说明轿车的车速 A. 大于100 km/h B. 小于100 km/h C. 等于100 km
A
在一条笔直的公路上有AB两地,他们相距150来自KM,甲乙两部巡警车分别从AB两地同时出发,沿公里匀速相向而行,
(1)因为距离是越来越近的所以距离是150-(7定号金散米沙0+80)X当然这里X<1题目说了问的是两车相遇之前(2)LZ这种题建议你画一下图其实很简单就是要理解题目其实意思就是...
展开阅读全文 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAG1BMVEUAAABuk71wj79vkr1wj79wn79vlL1vk75vk73EmhGbAAAACHRSTlMA0BDfIBDfv/U9wHQAAABISURBVBjTY6AlYBOC0OEJQIK9UQHEZpUQAJJMEmCpQIiYIohiBQlBpKASUCmwBETKQiiw2QFmunOjhAncKhYLkARcCihBWwAA5n0JqdkCrS4AAAAASUVORK5CYII=)
收起 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAHlBMVEUAAABuk71wj79vlL1wl79wn79vkr1vlL5vk75vk71klGr6AAAACXRSTlMA0BDfIBDfv7/eQcl1AAAARklEQVQY02OgNXA2QbBZLCc7ICQmSpogJIQUJytAOYETFZgkhSBsVhBDcaICRAJEA6XgEjApRhAJkmoAkmxFEK2KCQw0BAA5Lgp0ywp4owAAAABJRU5ErkJggg==)
在一条笔直的公路来自上有AB两地,他们相距150KM,甲乙两部巡警车分别从AB两地同时出发,沿公里匀速相向而行,
(1)因为距离是越来越近的所以距离是150-(70+80)X未见安望当然这里X<1题目说了问的是两以兰血车相遇之前(2)教LZ这种题建议你画一下图其实很简单就是要理解题目其实意思...
展开阅读全文 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAG1BMVEUAAABuk71wj79vkr1wj79wn79vlL1vk75vk73EmhGbAAAACHRSTlMA0BDfIBDfv/U9wHQAAABISURBVBjTY6AlYBOC0OEJQIK9UQHEZpUQAJJMEmCpQIiYIohiBQlBpKASUCmwBETKQiiw2QFmunOjhAncKhYLkARcCihBWwAA5n0JqdkCrS4AAAAASUVORK5CYII=)
收起 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAHlBMVEUAAABuk71wj79vlL1wl79wn79vkr1vlL5vk75vk71klGr6AAAACXRSTlMA0BDfIBDfv7/eQcl1AAAARklEQVQY02OgNXA2QbBZLCc7ICQmSpogJIQUJytAOYETFZgkhSBsVhBDcaICRAJEA6XgEjApRhAJkmoAkmxFEK2KCQw0BAA5Lgp0ywp4owAAAABJRU5ErkJggg==)
在一条笔直的来自公路上有两地,它们相还挥际觉某宗就从艺倍衡距150千米,甲乙两部巡警车分别从
建议以后提问完还是要检查一下题目是否发完整,否则是不可能得到解答的转机向伤印进移至.
在一条笔直到甚南曲的公路上有A、B两地,它们相距150Km,甲、乙两部巡警车分别从A、B两地同时出发,沿公路匀来自速相
(1)设两车距离为y,则y=150-(70+80)x即两车距离为150-波150x(2)由题意得两车距离在15km之内时360问答可保持通话,∴l150-150xl≤15即-15...
展开阅读全文 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAG1BMVEUAAABuk71wj79vkr1wj79wn79vlL1vk75vk73EmhGbAAAACHRSTlMA0BDfIBDfv/U9wHQAAABISURBVBjTY6AlYBOC0OEJQIK9UQHEZpUQAJJMEmCpQIiYIohiBQlBpKASUCmwBETKQiiw2QFmunOjhAncKhYLkARcCihBWwAA5n0JqdkCrS4AAAAASUVORK5CYII=)
收起 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAHlBMVEUAAABuk71wj79vlL1wl79wn79vkr1vlL5vk75vk71klGr6AAAACXRSTlMA0BDfIBDfv7/eQcl1AAAARklEQVQY02OgNXA2QbBZLCc7ICQmSpogJIQUJytAOYETFZgkhSBsVhBDcaICRAJEA6XgEjApRhAJkmoAkmxFEK2KCQw0BAA5Lgp0ywp4owAAAABJRU5ErkJggg==)
在一条笔直的公路上有A、B两地,它们相距150Km,甲、乙两部巡警车分来自别从A、B两地同时出发,沿公路匀速...
(1)甲车行驶路程=70X,乙车行驶路程=80X两车距离=150-70X-80X=150(1-X)(2)相遇之前相距15KM粒船时,150(1-X)=360问答15,X=0.9相...
展开阅读全文 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAG1BMVEUAAABuk71wj79vkr1wj79wn79vlL1vk75vk73EmhGbAAAACHRSTlMA0BDfIBDfv/U9wHQAAABISURBVBjTY6AlYBOC0OEJQIK9UQHEZpUQAJJMEmCpQIiYIohiBQlBpKASUCmwBETKQiiw2QFmunOjhAncKhYLkARcCihBWwAA5n0JqdkCrS4AAAAASUVORK5CYII=)
收起 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAHlBMVEUAAABuk71wj79vlL1wl79wn79vkr1vlL5vk75vk71klGr6AAAACXRSTlMA0BDfIBDfv7/eQcl1AAAARklEQVQY02OgNXA2QbBZLCc7ICQmSpogJIQUJytAOYETFZgkhSBsVhBDcaICRAJEA6XgEjApRhAJkmoAkmxFEK2KCQw0BAA5Lgp0ywp4owAAAABJRU5ErkJggg==)
在一条笔直的来自公路上有A、B两地,它们相距150千米,甲、乙两部巡警车分别从A360问答、B两地同时出发,沿公路匀速相再酸赵回向而行,分别驶往B、A两地.甲、乙两车的速度分别够为70千米/时、80千米/时,设行驶时间为x小时.(1)从出发到两车相遇之前,两车的距离是多少千米?(结果用含x的代数式表示)(2)已跑模知两车都配有
试题**:(1)∵AB两地相距150千米,甲乙x小时走的路程和为************千米,∴甲乙两人相距15********(千米).(2)方法1:相遇之后,*除植胞够州甲论...
展开阅读全文 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAG1BMVEUAAABuk71wj79vkr1wj79wn79vlL1vk75vk73EmhGbAAAACHRSTlMA0BDfIBDfv/U9wHQAAABISURBVBjTY6AlYBOC0OEJQIK9UQHEZpUQAJJMEmCpQIiYIohiBQlBpKASUCmwBETKQiiw2QFmunOjhAncKhYLkARcCihBWwAA5n0JqdkCrS4AAAAASUVORK5CYII=)
收起 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAHlBMVEUAAABuk71wj79vlL1wl79wn79vkr1vlL5vk75vk71klGr6AAAACXRSTlMA0BDfIBDfv7/eQcl1AAAARklEQVQY02OgNXA2QbBZLCc7ICQmSpogJIQUJytAOYETFZgkhSBsVhBDcaICRAJEA6XgEjApRhAJkmoAkmxFEK2KCQw0BAA5Lgp0ywp4owAAAABJRU5ErkJggg==)