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Physics in the Modern World by Jerry Marion (Auth.)

By Jerry Marion (Auth.)

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The antiproton carries a negative charge (that is, a charge opposite to that of the proton). The neutron and antineutron, although they have no electrical charge, nevertheless have opposite magnetic properties. In general, a particle is distinguished from its antiparticle partner by opposite electromagnetic proper­ ties. Antiparticles are just as "elementary" as ordinary particles. ), but we can imagine a world that is composed of antimatter. For ex­ ample, an atom of antihydrogen would consist of an an­ tiproton and a positron.

But if w e choose the first four sec­ onds, w e find v= 16 m/4 s = 4 m/s. In this case the speed is continually changing and by considering dif­ ferent time intervals, w e obtain different values for the average speed. In order to determine the speed precisely at t = 3 s {not the average speed between t = 2 s and i = 4 s ) , we must consider a very tiny time interval around t = 3 s. There is no restriction on how small an interval2 we may 6choose: w15e can imagine an interval of 10~ s or 10~ s or 1 0 ~ s.

3-2 in more precise form. W e can sim­ plify this still further by writing xx — x0 = Ax (see Fig. 3-4) and tx — t0 = At. T h e symbol Ax ("delta x") means "the change in JC" (it does not mean "Δ multiplied by JC"). Similarly, At means "the change in Then, w e have Ax At Time (a) (3-4) We can follow this same reasoning for the case of acceleration. The definition of acceleration is the change in speed per unit time: acceleration = change in speed time required for change (3-5) v0 Av At • (b) If the speed is v0 at t = t0 and is vx at t = t u then the average acceleration is a = Time (3-6) We can see the similarity in the definitions of speed and acceleration by referring to Fig.

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