It looks like a Bradford pear or one of the Callery pears. They are ornamental trees but are true Pyrus sp. Folks think that the wood of these trees is weak but the wood is strong like any pear tree but the structure is weak. You can see from the break that there was very little solid wood in that scar. About half of it is included bark. Once these trees get to a certain size the slightest wing in the right direction can cause these kinds of breaks.
The wood should make good bows. It is nice and straight with few knots. I'd say cut anything 2" in diameter or bigger. Try to get them as long as possible but cut shorter pieces for billets.
