Somebody starts from the Northern Hemisphere and walks 1100 meters to the north, southeast, and west

B is not good.

Our teacher didn't take into account the geostrophic deflection force when he taught us (the teacher upstairs thought about 1100 meters, why not 5500 meters, because the approximate length of 1° is 111 km, and this problem is about 10 degrees) (and when calculating the actual distance between two points in the graticule, for middle school students, you don't have to think about it that much).

Consider the coil of latitude decreasing from the equator to the poles.

Go north, walk 1100 (same meridian), then go east (because you go north about 10°, the weft becomes smaller, and you cross more meridians), then go south (the same meridian), then go west (you can think of going south, go back to the lower latitude of the weft, let's say it's still 10° longitude, the distance of the latitude included is longer), so go 1100 meters, and you will go back to the east of the starting point.

Take a globe and take a look.

b East of the point of departure.

Because the distance between the northern hemisphere and the north latitude is shorter (the meridians are all equal, but the latitudes are not equal), first go 1100 meters north, then 1100 meters east, then 1100 meters south, and finally 1100 meters west, and then you can't go back to the point of origin, you can only go back to the east of the point of origin.

(The earth is round, I can't figure it out, that's all).

——— choose ——— for this question

After looking at the answers upstairs, I found that they did not think about this question with geographical thinking, and this question is also a geography question, and their answer is wrong.

Listen to me: I'll refute D first, the basic choice of land belongs to the answer directly by feeling without thinking, don't say it. I also said that the one who chose B on the 3rd floor has nothing to do with the latitude and longitude lines, because the stem has already given you a fixed value, 1100 meters, and it is only redundant to consider the length of the latitude line in the case of a fixed value.

Unless the question doesn't tell you how far to go, you should think about it again. It is the same for a few laps in the case of a fixed value. c No one chooses, and everyone knows that it's not right.

Let's say the correct answer A: Anyone who has studied geography knows that the earth has a geostrophic deflection force. The northern hemisphere is biased to the right, the southern hemisphere is biased to the left, the question part is only emphasized in the northern hemisphere is to guide you to think about this knowledge point, due to the geostrophic deflection force, you go straight 1100 meters, it is impossible to walk in a straight line all the time, unless you walk along the meridian line, each time you deviate a little to the right and return to your starting point four times, you will find that you are north of the starting point, you can draw a square on the paper, and then set a starting point, deviate a little on each line and then return to the starting point, the result is clear at a glance.

I am a geography teacher, thank you.

Think of it this way: He goes north 1100, then south 1100, then east 1100, west 1100

Isn't that back to square one.

This question is not only complicated to consider according to the fixed thinking of the north, south, east and west.

And it is easy to lead to the wrong choice of B

d Because walking 1100 meters in the north and 1100 meters in the south is equal to not walking, and walking 1100 meters to the east and 1100 meters to the west is also equal to not walking It seems like this.

In the North Pole, everywhere in the South.

Summary. Hello, the distance between the two people is that they walked 6km and 8km respectively, someone walked 6km to the east, and then 8km to the south, asking for the distance that someone walked and two displacements.

Hello, the distance between the two of them is that the distance they walked was 6km and 8km respectively, and the displacement he walked was the distance between his starting and ending points.

His displacement is 10 km

Do you think I'm wrong?

Tell me, I'll give you the answer.

Otherwise, I think you're bad for a bad review.

Summary. The distance traveled is 6 + 8 = 14 km

Someone walked 6km east and then 8km south, and asked for the sum of the distance traveled by someone + and the two displacements.

The distance traveled is 6 + 8 = 14 km

Displacement 2=6 2+8 2=100, so the displacement is 10km to represent the meaning of square.

Because it can't be played here, it's always this instead.

Let the vector a=(2,-3)b=(x,-4)If a is perpendicular to b, is it still necessary to calculate x. x=6

Vector a·vector b=0; If the vector a=(x1,y1); vector b=(x2,y2), then x1x2+y1y2=0

According to the formula, 2x+12=0 is obtained, so x=-6 is obtained

The south and north of ABC follow the meridian, and if the same distance is traveled from north to south on different meridians, the relative north-south position remains unchanged.

Due east and west are along the latitude, because the size of the latitude coils on different longitudes is different, so the symmetry of the equator is selected A, the equator is selected to the south, and the equator is selected to the north

Walking due south and north will return to the original point, because we see the meridians as of equal length; The length of the latitude line decreases from the equator to the poles, = 111km The number of degrees of latitude spanned by the cosa (a is the local latitude), this problem is shown in the figure below, you can also draw it yourself.

The east-west direction refers to the parallel, and the north-south parallels are not the same length, so you can't go back to the same place.

West of the origin.

Walk 200km to the south, northwest and east in turn, which is along the longitude and latitude respectively, and the distance along the meridian is the same, and the latitude difference is also the same, so starting from the equator, it will return to the equator and go east along the equator, because on the latitude, the longitude difference is the same distance, and the equator is longer, so when the longitude difference of 200km in the southern hemisphere is more than 200km, the distance on the equator is greater than 200km, so if you go 200km to the east, you will not go back to the original point.

Pick B. Because the distance between the two meridians is uncertain, it gradually decreases from the equator to the pole. Traveling 1,100 km at the equator is not the same as walking 1,100 km at other latitudes, with the least latitude crossed at the equator.

The north-south east-west direction is related to latitude and longitude, and has nothing to do with distance.

In the question, he walks north in the first step and south in the third step, the distance is the same, and the latitude he passes through is the same; And the second step was 1,100 kilometers west north of the equator, and then the fourth step was 1,100 kilometers on the equator, and there was less longitude crossed on the equator, so he returned to the west of the original location.

You can understand it more intuitively by drawing a rough picture on the globe.

bTake a look at the diagram below and you'll understand.

Choose B, because of the latitude, the circumference of the equator is the longest, and it is more westward after returning. You can just take a ball-shaped object and compare it.