Compute the work done in moving a particle

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2022-04-21

Compute the work done in moving a particle from the point 𝑃(1,βˆ’1,0)π‘‘π‘œπ‘„(2,0,1)by application of force field 𝐹=2π‘₯𝑖+3𝑦𝑗+4π‘§π‘˜
 

Answer & Explanation

RizerMix

RizerMix

Expert2023-04-29Added 656 answers

We are given a force field Fβ†’=2xiβ†’+3yjβ†’+4zkβ†’ and we need to compute the work done in moving a particle from point P(1,βˆ’1,0) to Q(2,0,1).
To calculate the work done, we use the formula:
W=∫CFβ†’Β·drβ†’
where r→ is the position vector of the particle along the path C from P to Q.
First, we need to find the parametric equation of the line segment that connects P to Q. We can do this by using the vector equation of a line:
rβ†’(t)=Pβ†’+t(Qβ†’βˆ’Pβ†’)
where Pβ†’=<1,βˆ’1,0> and Qβ†’=<2,0,1>.
Substituting the values, we get:
rβ†’(t)=<1,βˆ’1,0>+t(<1,1,1>)
Simplifying, we get:
rβ†’(t)=<1+t,βˆ’1+t,t>
Next, we need to calculate dr→, which is the differential of r→ with respect to t.
dr→=<dx,dy,dz>
dr→dt=<1,1,1>
Therefore, dr→=<dx,dy,dz>=<dt,dt,dt>=dt<1,1,1>
Now, we can substitute these values into the formula for work:
W=∫CFβ†’Β·drβ†’=∫tPtQFβ†’(rβ†’(t))Β·drβ†’
where tP and tQ are the values of t that correspond to points P and Q on the path, respectively.
Substituting the values, we get:
W=∫01Fβ†’(rβ†’(t))Β·drβ†’
=∫01(2(1+t)iβ†’+3(βˆ’1+t)jβ†’+4tkβ†’)Β·(dt<1,1,1>)
=∫01(2+2tβˆ’3+3t+4t)dt
=∫01(9tβˆ’1)dt
=92t2βˆ’t\rvert01
=92(1)βˆ’1βˆ’92(0)+0
=72
Therefore, the work done in moving the particle from P to Q by the force field F→ is 72.

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