How far downstream has the boat moved?

  • Thread starter Thread starter asloudascanbe
  • Start date Start date
  • Tags Tags
    Boat
AI Thread Summary
The discussion revolves around calculating how far downstream a boat moves while crossing a river. The river flows east at 1.80 m/s, and the boat travels north at 9.0 m/s. To determine the downstream displacement, the time taken to cross the 400-meter width of the river is first calculated, which is approximately 44.44 seconds. The correct method to find the downstream distance is to multiply the river's velocity by this time, not divide. The problem is resolved by recognizing that distance equals velocity multiplied by time.
asloudascanbe
Messages
7
Reaction score
0
[SOLVED] How far downstream has the boat moved?

I can't figure out the last part of this question. It's probably very simple and I'm just over looking it. The answers in part A are right. I just don't know how to get part B.

A river flows due east at 1.80 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 9.0 m/s due north relative to the water.

(a) What is the velocity of the boat relative to shore?
9.178 m/s
78.69° (north of east)


(b) If the river is 400 m wide, how far downstream has the boat moved by the time it reaches the north shore?
m
 
Physics news on Phys.org
1. Find out the time the boat takes to traverse the 400 meters in the northern direction, at speed 9 m/s

2. Then find out the boat's (eastern) dowstream displacement in the same time .
 
So to fine the time it takes the boat to go 400 meters at a speed of 9 m/s. I divided 400/9.0 and got 44.4444s.

Then I thought to find the downstream displacement given that time you would just divide the 44.444s/(1.8m/s)? But that's wrong and I don't know what else to do?
 
What is distance?

Velocity MULTIPLIED WITH time!
 
SOLVED thanks...sorry for some reason I thought you divided it.
 
Thread 'Voltmeter readings for this circuit with switches'

Thread 'Voltmeter readings for this circuit with switches'

TL;DR Summary: I would like to know the voltmeter readings on the two resistors separately in the picture in the following cases , When one of the keys is closed When both of them are opened (Knowing that the battery has negligible internal resistance) My thoughts for the first case , one of them must be 12 volt while the other is 0 The second case we'll I think both voltmeter readings should be 12 volt since they are both parallel to the battery and they involve the key within what the...
View full post »
Thread 'Correct statement about a reservoir with an outlet pipe'

Thread 'Correct statement about a reservoir with an outlet pipe'

The answer to this question is statements (ii) and (iv) are correct. (i) This is FALSE because the speed of water in the tap is greater than speed at the water surface (ii) I don't even understand this statement. What does the "seal" part have to do with water flowing out? Won't the water still flow out through the tap until the tank is empty whether the reservoir is sealed or not? (iii) In my opinion, this statement would be correct. Increasing the gravitational potential energy of the...
View full post »

Similar threads

At what angle must the boat travel so that it moves in a straight line
Replies
25
Views
3K
Simple Vector Boat Problem, Conceptual Misunderstanding
Replies
2
Views
2K
A ferry boat is crossing a river that is 8.5 x 10^2 m wide.
Replies
5
Views
3K
River question (looking for angles and headings)
Replies
8
Views
2K
Relative Velocity: How Far Will the Boat Move Downstream Without Correction?
Replies
1
Views
1K
Fisherman's boat Relative motion
Replies
29
Views
3K
Adding Vectors to Find Velocity
Replies
16
Views
3K
What is the speed of the boat relative to the water?
Replies
6
Views
4K
Need Help with Vector Problem? Confused About Velocity and Angle?
Replies
2
Views
2K
Stuck on a vector problem: Boating across a river
Replies
11
Views
3K

Hot Threads

Recent Insights

Back
Top