Simple Q&A D&D 3.5 (by RAW) XXIII

[Curmudgeon]

A 379 [correction] Yes.

Unarmed strikes are natural weapons, which have the unique property of allowing iterative attacks as manufactured weapons do. (Being on the Weapons table just stipulates that it's a weapon, not that it's a manufactured weapon.) Some more extensive quotes from the rules to reinforce Urpriest's point:

You can’t cast this spell on a natural weapon, such as an unarmed strike.

You can’t cast this spell on a natural weapon, such as an unarmed strike (instead, see magic fang).

Magic fang gives one natural weapon of the subject a +1 enhancement bonus on attack and damage rolls. The spell can affect a slam attack, fist, bite, or other natural weapon. (The spell does not change an unarmed strike’s damage from nonlethal damage to lethal damage.)

A fanged ring grants its wearer the Improved Unarmed Strike feat and the Improved Natural Attack (unarmed strike) feat.

Improved Natural Attack requires a natural weapon, and the Fanged Ring works with unarmed strike as that natural weapon for the granted feat.

The Monk class allows their unarmed strike to also be treated as a manufactured weapon. However, I think it's pretty obvious that an unarmed strike isn't the product of a blacksmith, but rather a natural weapon.

A 380

The Vow of Poverty rules are simple and unyielding.

You may not, however, “borrow” a cloak of resistance or any other magic item from a companion for even a single round

If the character can dispossess themselves of the magic item forced upon them before a single round has expired then they will not break their vow. Wearing any magic item, cursed or not, for a full round will break the vow.

A 381 Yes.

The Balance check to resist being tripped replaces the usual Dexterity or Strength check. An ability check is always just 1d20 + the appropriate ability modifier, so the size modifier specified in the trip rules is not part of the ability check which you're replacing. Instead, the size modifier is added separately.