Displacement


by Kdawg
Tags: displacement
Kdawg
Kdawg is offline
#1
Sep19-04, 02:09 PM
P: 34
I have to displacment problems that i cant get right.

While John is traveling along a straight interstate highway, he notices that the mile marker reads 233. John travels until he reaches the 155-mile marker and then retraces his path to the 172-mile marker. What is John's resultant displacement from the 233-mile marker?
I thought the answer for this one would be 61 but it is marked wrong.

Bob walks 57 m and then he walks 125 m. What is Bob's displacement if he walks east then west?
I thought the answer for this one would be 68 but it is marked wrong.
Phys.Org News Partner Science news on Phys.org
NASA's space station Robonaut finally getting legs
Free the seed: OSSI nurtures growing plants without patent barriers
Going nuts? Turkey looks to pistachios to heat new eco-city
CinderBlockFist
CinderBlockFist is offline
#2
Sep19-04, 02:37 PM
P: 86
For the second problem, Try negative -68, cause he goes past the origin, to the negative side. Also, the first answer may be negative also, not sure though.
Kdawg
Kdawg is offline
#3
Sep19-04, 02:51 PM
P: 34
Thanks, that was it. for some reason I was thinking displacement couldnt be negative.

antiflag403
antiflag403 is offline
#4
Sep19-04, 04:35 PM
P: 47

Displacement


displacement is a vector quantity. all vector quantities are affected by direction. therefore all vector quantities should be labeled with a direction (wether it be shown with a positive/negative sign, bearing on a compass,etc)
recon
recon is offline
#5
Sep20-04, 05:22 AM
recon's Avatar
P: 406
Quote Quote by Kdawg
I have to displacment problems that i cant get right.

While John is traveling along a straight interstate highway, he notices that the mile marker reads 233. John travels until he reaches the 155-mile marker and then retraces his path to the 172-mile marker. What is John's resultant displacement from the 233-mile marker?
I thought the answer for this one would be 61 but it is marked wrong.

Bob walks 57 m and then he walks 125 m. What is Bob's displacement if he walks east then west?
I thought the answer for this one would be 68 but it is marked wrong.
Both answers would have been correct had you included the negative sign for both.


Register to reply

Related Discussions
displacement Introductory Physics Homework 1
displacement Introductory Physics Homework 0
Help with displacement Introductory Physics Homework 15
Displacement Introductory Physics Homework 7
displacement Introductory Physics Homework 2