試題詳解

3. A uniform sphere of radius R has a spherical hole of radius R/2 removed. The center of the sphere and the hole are located at x = 0 and x = -R/2, as shown in the figure. Where is the center of the mass of this system?

(A) x = 0
(B) x = R
(C) x = R
(D) x = R
(E) x = R