In unit-vector notation, what is the net torque about the origin on a flea located at coordinates (0, ?4.0 m, 5.0 m) when forces \(\vec{F}_{1}=(3.0 \mathrm{N}) \hat{\mathrm{k}}\) and \(\vec{F}_{2}=(-2.0 \mathrm{N}) \hat{\mathrm{j}}\) act on the flea? Text Transcription: vec F_1 =(3.0N) hat k vec F_2=(-2.0N) hat j
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Textbook Solutions for Fundamentals of Physics
Question
Force \(\vec{F}=(-8.0 \mathrm{N}) \hat{i}+(6.0 \mathrm{N}) \hat{j}\) acts on a particle with position vector \(\vec{r}=(3.0 \mathrm{m}) \hat{\mathrm{i}}+(4.0 \mathrm{m}) \hat{\mathrm{j}}\). What are (a) the torque on the particle about the origin, in unit-vector notation, and (b) the angle between the directions of \(\vec{r}\) and \(\vec{F}\)?
Text Transcription:
vec F=(-8.0N) hat i +(6.0N) hat j
vec r=(3.0m) hat i +(4.0m) hat j
vec r
vec F
Solution
The first step in solving 11.4 problem number trying to solve the problem we have to refer to the textbook question: Force \(\vec{F}=(-8.0 \mathrm{N}) \hat{i}+(6.0 \mathrm{N}) \hat{j}\) acts on a particle with position vector \(\vec{r}=(3.0 \mathrm{m}) \hat{\mathrm{i}}+(4.0 \mathrm{m}) \hat{\mathrm{j}}\). What are (a) the torque on the particle about the origin, in unit-vector notation, and (b) the angle between the directions of \(\vec{r}\) and \(\vec{F}\)?Text Transcription:vec F=(-8.0N) hat i +(6.0N) hat jvec r=(3.0m) hat i +(4.0m) hat jvec rvec F
From the textbook chapter Torque Revisited you will find a few key concepts needed to solve this.
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