According to the periodic table of elements, calcium (ca) has: a- 20 protons and 20 electrons b- 40.08 protons c-20 protons and 20.08 electrons d-20 protons and zero electrons

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

Mutt and jeff are running along a path each pushing a cart loaded with rocks. if mutt's wagon has a mass two times greater than jeff's and they want to stay together, arriving at their destination at the same time, what must happen? a) jeff should slow down so mutt can catch up. b) mutt must use half as much force to push his cart. c) mutt must use twice as much force to push his cart. d) mutt and jeff will use the same force, but mutt will take bigger steps.

Light traveling in a medium with a refractive index 1.19 is incident on a plate of another medium with index of refraction 1.79. at what angle of incidence is the reflected light fully polarized?