A 30 kg dog is running at 1 m/s and quickly comes to a stop when she sees her bone. What is her mass?

In what direction does the medium move relative to the direction of the wave? explain.

An electron and a proton have the same kinetic energy upon entering a region of constant magnetic field and their velocity vectors are perpendicular to the magnetic field. suppose the magnetic field is strong enough to allow the particles to circle in the field. note: you'll need to look up the masses for an electron and proton. 1) what is the ratio of the radii of their circular paths rp/re?

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity