Specify the weight W$,$ width w$,$ and depth d for the base of a particular model of a flu$-$ orescent desk lamp. For this lamp, the shade and lightbulb assembly C weighs $1\mathrm{.}8$ lb$,$ and the movable arm AB$,$ including the attachments at A and B$,$ weighs $1\mathrm{.}5$ lb with center of gravity approximately midway between points A and B$.$ For the weight of the base W that you select, the dimensions d and w should be such that the lamp is as tip$-$resistant as possible.