Which of the following accurately describes properties of valence? a. the smaller the number of electrons an atom has to borrow or to lend, the greater the activity of the atom. b. metals tend to have a negative valence and tend to be electron borrowers. c. the greater the number of electrons an atom has to borrow or to lend, the greater the activity of the atom. d. nonmetallic elements tend to have a positive valence and tend to be electron borrowers.

The great sandini is a 60.0-kg circus performer who is shot from a cannon (actually a spring gun). you don’t find many men of his caliber, so you him design a new gun. this new gun has a very large spring with a very small mass and a force constant of 1100 n/m that he will compress with a force of 4400 n. the inside of the gun barrel is coated with teflon, so the average friction force will be only 40.0 n during the 4.00 m he moves in the barrel. at what speed will he emerge from the end of the barrel, 2.50 m above his initial rest position?