Register to reply

A mechanics question about work and vectors

by iwsdw
Tags: dimension, vectors, work
Share this thread:
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.''
Phys.Org News Partner Science news on
Bees able to spot which flowers offer best rewards before landing
Classic Lewis Carroll character inspires new ecological model
When cooperation counts: Researchers find sperm benefit from grouping together in mice
Nov13-12, 11:52 AM
PF Gold
P: 1,053
What specifically do you need help (or are having trouble) with? Please elaborate.
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?

Nov13-12, 01:19 PM
Sci Advisor
HW Helper
PF Gold
Chestermiller's Avatar
P: 5,064
A mechanics question about work and vectors

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

Register to reply

Related Discussions
Potential Energy/Work done question AS Level Physics - Mechanics Introductory Physics Homework 4
How does this work? Fluid Mechanics question (?) regarding garden hose attachment Classical Physics 4
Mechanics with vectors question! Introductory Physics Homework 1
Mechanics - Work and Kinetic Energy question Introductory Physics Homework 8
Quantum Mechanics Question - Work function and h Introductory Physics Homework 0