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determine the total distance traveled and the displacement made. A. 5.0 km 15 degrees...

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arze05 | eNotes Newbie

Posted August 3, 2013 at 8:08 AM via web

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determine the total distance traveled and the displacement made. A. 5.0 km 15 degrees east of north B. 5.0 km 20 degrees east of south C. 5.0 km east D. 5.0 km 30 degrees south of west E. 5.0 km 20 degrees east of south F. 5.0 km 40 degrees north of west G. 5.0 km 40 degrees west of south H. 5.0 km 15 degrees east of north I. 5.0 km 60 degrees west of north J. 5.0 km east

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llltkl | College Teacher | (Level 3) Valedictorian

Posted August 4, 2013 at 1:45 PM (Answer #1)

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Beginning the journey at the origin, and considering the directions and 5 kM distance travelled in each direction, the co-ordinates of points A through J can be worked out by adding/subtracting sine and cosine functions of the subtended angles, multiplied by 5 in each position.

These coordinates are as follows:

Point      x-coordinate       y-coordinate                                   --------- ---------------- -------------------

A      1.2941         4.8296

B      3.0042        0.1312

C      8.0042        0.1312

D      3.6741       -2.3688

E      5.3842        -7.0673

F       1.5539        -3.8534

G       -1.6600       -7.6836

H       -0.3659       -2.8540

I        -4.6960       -0.3540

J         0.3040       -0.3540

-----------------------------------------

Finally, the overall displacement (i.e. distance between origin, O and final point, J) is obtained from the two-point distance formula:

OJ`= [sqrt((0.3040-0)^2+(-0.3540-0)^2)] =0.467` kM

Distance travelled = 5*10=50 kM.

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