Asked Dec 16, 2019

A hiker walks 2.00 km north and then 3.00 km east, all in
2.50 hours. Calculate the magnitude and direction of the
hiker’s (a) displacement (in km) and (b) average velocity (in
km/h) during those 2.50 hours. (c) What was her average
speed during the same time interval?


Expert Answer

Step 1

Take the north direction to be +y direction and east direction to be +x direction.


Image Transcriptionclose

Take the initial position of the hiker to be origin oi +0j . The position vector of the hiker after walking 2.00km through north is (oî +2.00 kmj) . From this position, the hiker travels along the east direction. During this motion, the y component of the hacker will be same as 2.00km. The x- component will increase by 3.00 km. Thus, the position vector of the hiker will be (3.00 km)i + (2.00 km) j . The equation for the displacement is given by, AF =ï; -T, Here, AF is the displacement, 7, is the final position vector and 7; is the initial position vector. Substituting, AF = (3.00 km)î + (2.00 km) ĵ–(oî + oj) = (3.00 km)î + (2.00 km) ĵ %3D The magnitude of the displacement is given by, Ar = JAr? + Ar? Here, Ar is the magnitude of the displacement, Ar, is the x-component of the displacement and Ar, is the y component of the displacement.

Step 2

Substituting the...


Image Transcriptionclose

Ar = J(3.00 km)´ +(2.00 km = 3.61 km The direction of the displacement is given by, Δι. У e = tan Ar. Here, 0 is the angle made by the displacement vector with the +x-axis. Substituting the values, 2.00 km -1 e = tan 3.00 km = 33.69° The hiker's displacement is 33.69° north of east. (b) The equation for the average velocity is given by, AF %3D avg At Here, i is the average velocity and At is the time taken for the motion. avg


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