A neutron star is a highly compressed ball of neutrons, about 10-15 miles wide, that is left after certain supernova explosions. If it is spinning fast and flashing a beam periodically in our direction, then we see pulses of light coming from it (mostly radio wave light). Then we can call it a pulsar. What factor strongly focuses particles into two beams that glow outward from the pulsar?

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

An object resting on a table weighs 100 n. with what force is the object pushing on the table? with what force is the table pushing on the object? explain how you got your answer.

What does si stand for, when referring to a system of measurement