Matthew is looking at two different atoms. one has 8 protons and 10 neutrons. the other substance has 8 protons and 12 neutrons. are these the same element? why or why not?

Which of the following are considered noble gases? a. bromine b. neon c. argon d. chlorine

What is the coefficient of kinetic friction μk between the block and the tabletop?

A5 foot by 5 foot box culvert is buried 6 feet beneath the surface of the ground. a crosssection of this very long culvert (into and out of the page) is illustrated below. assume that the soil in which the culvert is buried has the following properties: jt = 120 pcf, w = 12%, ko = 0.50, ka = 0.33, and kp = 3.00. calculate the total horizontal force per unit length of culvert (fh) felt on one of the vertical faces of the culvert.