1)
What are Yesarim?
1.
Rashi: They are thin ropes [Radak - from moist shoots].
2)
What is the meaning of "v'Chalisi"?
1.
Radak citing Targum Yonasan: I will become weak.
3)
He answered only one of her two questions!
1.
Malbim: He implied that he does not know a reason for his strength, i.e. it is natural, just he tested that through this he can be bound.