汽车以15m/s的速度向对面高山驶去,在司机鸣笛后4s听到了回声,则听到回声时,汽车距高山多远?
汽车以15m/s的速度向对面高山驶去,在司机鸣笛后4s听到了回声,则听到回声时,汽车距高山多远?
数学人气:332 ℃时间:2019-09-22 08:52:07
优质解答
(1)在t=4s的时间内,汽车行驶的距离:s1=v1t=15m/s×4s=60m,声音传播的距离:s2=v2t=340m/s×4s=1360m,设司机鸣笛时汽车到高山的距离为s,则:2s=s1+s2,∴s=s1+s22=60m+1360m2=710m;(2)司机听到回声汽车距高...
我来回答
类似推荐
猜你喜欢
- 1how long will it take us to get there?
- 2计算:0.1+0.3+0.5+0.7+0.9+0.1 1+0.13+0.15+0.17+0.19.
- 3别字组词
- 4I feel like going to the cinema tonight,( ) don't I don't you do I do you
- 5Try not to get into your mouth anything that will have to be taken out的意思
- 6want的近义词
- 7he is the strongest student in our class =he is ( )( )( )( )studentin our class
- 8已知二次函数f(x)=ax²+bx满足f(2)=0,且方程f(x)=x有等根,求f(x)的解析式.
- 9若x=2是关于x的方程2x+3m-1=0的解,则m的值为多少?
- 10当x= 或 时,X的平方等于5X