Why are the four inner planets in our solar system dense and rocky while the outer planets are gaseous? a) in the young universe hydrogen and helium where the only elements. b) intense radiation from our sun blasted much of the hydrogen and helium into the outer reaches of our solar system, while heavier elements remained closer. c) planets form from particles in a disk of gas and dust, colliding and sticking together as they orbit the star. d) a small contending planet, about one-tenth the size of earth, must have collided with earth about 4.45 billion years ago.

Acup of coffee sits on the dashboard of an automobile. the car goes around a sharp curve. even though you hold the cup still, coffee still splashes out. this can best be explained due to a) density. b) friction. c) gravity. d) inertia.

The material that keeps its new shape after it is stretched is called?

To understand the behavior of the electric field at the surface of a conductor, and its relationship to surface charge on the conductor. a conductor is placed in an external electrostatic field. the external field is uniform before the conductor is placed within it. the conductor is completely isolated from any source of current or charge. part a: which of the following describes the electric field inside this conductor? it is in the same direction as the original external field.it is in the opposite direction from that of the original external field.it has a direction determined entirely by the charge on its surface.it is always zero. part b: the charge density inside the conductor is: 0non-zero; but uniformnon-zero; non-uniforminfinite part c: assume that at some point just outside the surface of the conductor, the electric field has magnitude e and is directed toward the surface of the conductor. what is the charge density η on the surface of the conductor at that point? express your answer in terms of e and ϵ0