在抗洪抢险中,战士驾驶摩托艇救人.假设江岸是平直的,洪水沿江

在抗洪抢险中,战士驾驶摩托艇救人.假设江岸是平直的,洪水沿江向下游流去,水流速度为v1,摩托艇在静水中的航速为v2,战士救人的地点A离岸边最近处O的距离为d.如战士想在最短时间内将人送上岸,则摩托艇登陆的地点离O点的距离为  (      )

A      B0        C         D

答案

【答案】C

【解析】

因为,所以摩托艇登陆的最短时间:,登陆时到达O点的距离:

故选C

【考点】运动的合成与分解

相关题目

Noise pollution in cities is causing out health to suffer, according to the Wor
Noise pollution in cities is causing out health to suffer, according to the World Health Organization. Recently, researchers at the Free University of Brussels in Beigium have developed an applocat
He is an ________ (精力充沛) boy; Heenjoys sports.  
He is an ________ (精力充沛) boy; Heenjoys sports.  
如图1所示的三个物体A、B、C,其质量分别为m1、m2、m3,带有
如图1所示的三个物体A、B、C,其质量分别为m1、m2、m3,带有滑轮的物体B放在光滑平面上,滑轮和所有接触面间的摩擦及绳子的质量均不计.为使三物体
若数列{an}是正项递减等比数列,Tn表示其前n项的积,且T8=T1
若数列{an}是正项递减等比数列,Tn表示其前n项的积,且T8=T12,则当Tn取最大值时,n的值等于( ) A.9  B.10  C.11  D.12
“酒是陈的香”,就是因为酒在储存过程中生成了有香味的
“酒是陈的香”,就是因为酒在储存过程中生成了有香味的乙酸乙酯,在实验室我们也可以用右图所示的装置制取乙酸乙酯。请回答下列问题: (1)
Compared with his sister, Jerry is even more ____   to, and more easily troubl
Compared with his sister, Jerry is even more ____   to, and more easily troubled by , emotional and relationship problems. A. sceptical           B. addicted          C. available
达·芬奇的《蒙娜丽莎》和张择端的《清明上河图》都体现了
达·芬奇的《蒙娜丽莎》和张择端的《清明上河图》都体现了当时艺术内容世俗化的倾向,其共同原因在于                              
--I am sorry to hear that. -- _______. A.I am sorry to hear that    
--I am sorry to hear that. -- _______. A.I am sorry to hear that                       B.Please don't C.Thank you for telling me                    

最新题目