A spider crawls 1 m due north, 2 m due east, and then climbs 3 m vertically upwards on a wall. What is the magnitude of the resultant displacement?



Answer :

To determine the magnitude of the resultant displacement of the spider, we need to consider its movements in three dimensions:

1. Movement due north: The spider crawls 1 meter north. We can denote this as [tex]\(x = 1\)[/tex] meter.

2. Movement due east: The spider then crawls 2 meters east. We can denote this as [tex]\(y = 2\)[/tex] meters.

3. Vertical movement upwards: Finally, the spider climbs 3 meters vertically upwards. We can denote this as [tex]\(z = 3\)[/tex] meters.

The resultant displacement is a vector that combines these three individual movements. To find the magnitude of this resultant displacement vector, we use the three-dimensional version of the Pythagorean theorem:

[tex]\[ \text{Resultant Displacement} = \sqrt{x^2 + y^2 + z^2} \][/tex]

Now plug in the given values:

[tex]\[ \text{Resultant Displacement} = \sqrt{(1)^2 + (2)^2 + (3)^2} \][/tex]

Performing each of the calculations inside the square root:

[tex]\[ 1^2 = 1 \][/tex]
[tex]\[ 2^2 = 4 \][/tex]
[tex]\[ 3^2 = 9 \][/tex]

Now, sum these squared values:

[tex]\[ 1 + 4 + 9 = 14 \][/tex]

Finally, take the square root of the sum:

[tex]\[ \sqrt{14} \approx 3.7416573867739413 \][/tex]

Thus, the magnitude of the resultant displacement of the spider is approximately [tex]\(3.7416573867739413\)[/tex] meters.