Blackboard * Test Information Desciption Unit 1 Exam is open now Timed TostThis

Question

Blackboard * Test Information Desciption Unit 1 Exam is open now Timed TostThis test has a time limit of 1 hour and 25 minutes You will be notified when time epires, and you may continue or submit Multliple Attempts Not allowed. This test can only be taken once Wamings appear when half the time, 5 minutes, 1 minute, and 30 seconds nemain Farce Completion This test can be saved and resumed later The timer will continue to nun if you leave the test Remaining Time: 44 minutes, 13 seconds Question Completion Status: 15] Meding to another qunstion wil save tis response Question 5 Arvin the Ant is on a picnic table He tr avelis 30 cm eastwand, then 25 cm northwand and inaly 15 cm westeard Whuat is the magnitude of Arvin's net displacement 70cm 57 cm 52 cm 29cm 5 6 7 8

Explanation / Answer

The problem can be easily solved by using unit vectors -

First displacement = 30cm i + 0 j
Second displacement = 0 i + 25cm j
Third displacement = -15cm i + 0 j

So, total displacement = 30cm i + 0 j + 0 i + 25cm j - 15cm i + 0 j  
= 15 cm i + 25 cm j

So, its magnitude = sqrt[15^2 + 25^2] = 29.15 cm

So, the last option 29 cm is the correct answer.

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