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A mechanics question about work and vectors

by iwsdw
Tags: dimension, vectors, work
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iwsdw
#1
Nov13-12, 11:35 AM
P: 3
this year i started studying physics, so this question might be easy but i couldn't do it... i'll be happy if you help me.

''A constant force (5N)i-7(N)j is applied on an object and it moves. The total displacement of the object is l=(3)i+(6)j+(3)k. Find the angle between the force and the displacement.''
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lewando
#2
Nov13-12, 11:52 AM
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What specifically do you need help (or are having trouble) with? Please elaborate.
iwsdw
#3
Nov13-12, 12:09 PM
P: 3
I don't know how to find the angle. How can I use the displacement information to find the angle?

Chestermiller
#4
Nov13-12, 01:19 PM
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A mechanics question about work and vectors

How is the dot product of two vectors related to the angle between them?
iwsdw
#5
Nov14-12, 02:39 AM
P: 3
Ah yes! Thank you very much. ^^


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