6 質量m的粒子在x-y平面上的運動軌跡為(x,y)=(2t²，3t³-1)，則在t=1時(A)粒子的速度y分量為4(B)作用在粒子上的力y分量為18(C)以原點為參考點的角動量大小為2m(D)以(1,-1)為參考點的角動量大小為-3m(E)以上皆非

15 When there is a net static charge present on an isolated perfect conductor(A)the charge will be uniformly distributed over the surface of the conductor.(B)the surface charge density will be greatest where the conductor is flat and smallest where there are sharp points.(C)the electric field inside the conductor needs not be zero if the conductor is hollow.(D)every point throughout the entire conductor will be at zero potential.(E)every point throughout the entire conductor will be at a constant potential, but not necessarily at zero potential.

6 質量m的粒子在x-y平面上的運動軌跡為(x,y)=(2t²，3t³-1)，則在t=1時

(A)粒子的速度y分量為4

(B)作用在粒子上的力y分量為18

(C)以原點為參考點的角動量大小為2m

(D)以(1,-1)為參考點的角動量大小為-3m

(E)以上皆非

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