A boat crosses a river with a velocity of `8(km)/(h)`. If the resultin – InterviewSolution

InterviewSolution

1.	A boat crosses a river with a velocity of `8(km)/(h)`. If the resulting velocity of boat is `10(km)/(h)` then the velocity of river water isA. `12.8 km//h`B. `6 km//h`C. `8km//h`D. `10 km//h`
Answer» Correct Answer - B `vec(v)_(r//g)=vec(v)hati,vec(v)_(b//r)=8 hatj, \|vec(v)_(b//g)\|=10` `vec(v)_(b//g)=vec(v)_(b//r)+vec(v)_(r//g)=8hatj+vhati` `\|vec(v)_(b//g)\|=sqrt((8)^(2)+v^(2))` `10=64+v^(2) implies v=6km//h`

Discussion

No Comment Found

Related InterviewSolutions

A train of `150 m` length is going toward north direction at a speed of `10 ms^-1`. A parrot flies at a speed of `5 ms^-1` toward south direction parallel to the railway track. The time taken by the parrot to cross the train is equal to.A. `30s`B. `15s`C. `8s`D. `10s`
A boat crosses a river with a velocity of `8(km)/(h)`. If the resulting velocity of boat is `10(km)/(h)` then the velocity of river water isA. `12.8 km//h`B. `6 km//h`C. `8km//h`D. `10 km//h`
A boat is moving with a velocity `3 hat i+ 4hat j` with respect to ground. The water in the river is moving with a velocity `-3 hat i - 4 hat j` with respect to ground. The relative velocity of the boat with respect to water is.A. `8j`B. `-6i-8j`C. `6i+8j`D. `5sqrt(2)`
In the previous problem, How far from the point directly opposite to the starting point does the man reach the opposite bankA. `1//6sqrt(3)km`B. `2//3sqrt(3)km`C. `4//3sqrt(3) km`D. `5//sqrt(3) km`
A motorboat coverse a distance between two points in `4h` along the flow and in `8h` opposite to the flow. In how much time, distance can be covered in still water?