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Torque and angular momentum for a Particle in a Force Field 
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#1
Apr1708, 08:15 AM

P: 8

Find A) the torque and B) the angular momentum about the origin at the time t=3 for a particle in a Force Field F=(3t^2 4t)i + (12t 6)j + (6t  12t^2)k. Assuming that t=0 is located at the origin.
I equated r"=F then took r X F is this the proper way? Then took r X v to find angular momentum. Any help would be appreciated. 


#2
Apr1708, 10:54 PM

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P: 25,228

Yes, that's the right way. Solve the differential equation r''=F and find v and r at t=3. You not only need to assume r(0)=(0,0,0), you need some initial condition for r'(0). Is it also (0,0,0)?



#3
Apr1808, 10:20 AM

P: 8

Thanks for the confirmation



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