Determine the neutron flux in a sphere of non-multiplying materiel of radius r if an isotropic point source of strength s0 neutrons per second is placed at the center of the sphere. assume the sphere is surrounded by vacuum.

Aman pushes on a trunk with a force of 250 newtons. the trunk does not move. how much positive work is done on the trunk? 0.0 j -250 j 250 j 125 j

An object has a weight of 500 on earth what is the mass of this object

Which of the following are properties of mechanical waves? check all that apply ⭕️ particles of the medium move back and fourth, but do not move with the wave. ⭕️ the particles of the medium always move parallel to the wave motion. ⭕️ wave motion begins with a disturbance in the medium. ⭕️ waves transport energy from a source outward, away from the source.