Zoom out to at least an eye altitude of 15 miles and examine the major river in this drainage ba

Zoom out to at least an eye altitude of 15 miles and examine...

Key Concepts

Drainage Basin

A drainage basin refers to the geographic area where all precipitation collects and drains off into a common outlet, such as a river, lake, or ocean. This concept is fundamental to understanding how water flows across land, influenced by topography and natural boundaries, which in turn can shape the river's course and behavior.

River Flow Direction

River flow direction is a primary geographic feature determined by the elevation and slope of the landscape within a drainage basin. It involves analyzing the overall course of a river from its source to its mouth, taking into account factors like gravity, topography, and the natural contours of the land.

Scale and Perspective in Geographical Analysis

Using an elevated perspective, such as an eye altitude of 15 miles, allows for a comprehensive view of a region’s geography. This macroscopic viewpoint is crucial for identifying general patterns of landscape features like drainage networks and determining the overall direction of river flow over large areas.

Transcript

00:01 In this objective type cution given data is that is you can see that there is a figure given so first i will draw this figure and explain the data that is given so in the cution information is given for a river so i can say that assume this is a river so now cution is saying that this river is flowing from west to east so if i consider that the direction is is that is this is a north this is a east this is a south and this is the west then i can see that the river is flowing in this direction so that means west to east and the speed is given magnitude of river that is sorry magnitude of speed of river is given that is we are that is equal to five meter per second and now further information is given that is there is a swimmer given so initially this swimmer is here at point a and after it in the question the speed of swimmer is given that is it is trying to swim so speed is given that means we as a speed of swimmer that is equal to 10 meter per second and in the question it is asking that the swimmer tries trying to move and coming to opposite side of a that means if i consider that this is the point b which is straight opposite to side a so that means this swimmer after moving it is trying to come at b so now in the question it is asking that what direction should he swim from a point so that it will reach opposite to a that means it will reach directly at b point that is that means this information is given and it is asking that we have to find the direction of the swimmer so now you can see that there are four options given so after solving my answer is that is option c now i will give the explanation so the explanation is here i am again drawing the figure to show the data that is given so you can see that this is the river and this is the starting point and consider that this is the opposite it to point a given named that is b so now swimmer is trying to swim in this direction which is making a angle theta with the vertical so this side is showing that vector vs and this side will show that vector vr that means speed of sorry velocity vector of river and this will show that velocity vector of swimmer so now next step is after drawing this figure i will trying to find the value of sine theta so sine theta will be look this figure so that i consider that sin theta is equal to we are divided by vs that means magnitude of speed of river divided by magnitude of speed of summer so now use the data that is given so i consider sign theta will be equal to that is 5 over 10 or i can say that after solving theta will be that is taking a sine inverse to both side and after simplifying i will get the theta that is equal to 30 degree so so you can see that i had get the value of angle that is theta that is 30 degree and now you can see that this theta is from vertical so that means i can say that the swimmer is trying to swim 30 degree west of north because swimmer is in this direction so here you can see that this is the north and this is the south this is the east and this is the west this in the cushion the river direction is given that is west to east and you consider simmer and swimmer is trying to make a angle theta with the vertical and moving in the direction that is making angle from north of from west of north that is theta so here in the result i had got the value of that theta that is 30 degree so direction will be that is 30 degree west of north so now next step is compare this result with the given option.

07:02 So the option which is matching with the answer that is option c.

07:06 Sorry, option c...

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