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103年 - 103 淡江大學 轉學考 理論力學#53325
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(b) [10%] The time differential of the linear momentum of the system is equal to the sum of all the external forces, as long as the internal forces follow 广-fp, where fy is the force acted on particle i by particle j.
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3. An one-dimensional particle at rest is attracted toward a center by a force F=-2w^/jc3, where m is the mass of the particle, A: is a constant and x is the coordinate of the particle, (a) [10%] Find the potential energy resulted from the force.
#195391
(b) [5%] Write down the Newton equation of motion for the particle.
#195392
(c) [10%] Show that the time required for the particle to reach x=0 from a distance d is
#195393
4. A system is composed of n particles, with each particle's mass described by where i=l, 2, n. The total mass of the system is denoted by M. Show that (a) [10%] The linear momentum of the system is the same as if a single particle of mass Mwere located at the position of the center of mass and moving in the manner the center of mass moves.
#195394
(c) [5%] The total linear momentum for a system free of external forces is constant and equal to the linear momentum of the center of mass.
#195396
5. Two particles of mass m and m2 move in a plane and interact with each other by a central forces with the potential energy U{r)=M2 k r2，where A: is a constant, r叫ri-r2|, ri and 1*2 are position vectors of the two particles. (a) [5%] Write down the Lagrangian of the system.
#195397
(b) [10%] Show that the center of mass of the system moves in a constant velocity.
#195398
(c) [10%] Using Lagrangian dynamics to show that the motion of the system can be reduced to an equivalent one-body problem.
#195399
沒有 【段考】高三英文 權限，請先開通．
#195400
沒有 【段考】高三英文 權限，請先開通．
#195401
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