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Torque and angular momentum for a Particle in a Force Field

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so09er
#1
Apr17-08, 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.
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Dick
#2
Apr17-08, 10:54 PM
Sci Advisor
HW Helper
Thanks
P: 25,244
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)?
so09er
#3
Apr18-08, 10:20 AM
P: 8
Thanks for the confirmation


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