1. a material that is malleable and conducts electricity is most likely : (a) wood (b) ice (c) a metal (d) motor oil
2. what physical property makes wax good for making sculpture molds? (a) low conductivity (b) malleable (c) high density (d) melting point
3. filtration can be used to separate mixtures based on : (a) their boiling points (b) their densities (c) their melting points (d) the size of their particles

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?