A neutron of mass m moving with velocity v collides head-on and elastically with a stationary nucleus of mass M. Show that the velocity of the nucleus after the collision, U, is given by U= 2mV/(m+M)

Which type of microscope would allow the viewer to see ribosomes inside a cell?

Sort the images based on whether there's a force of attraction or repulsion between the magnets shown. attraction repulsion

Consider a uniformly charged ring in the xy plane, centered at the origin. the ring has radius a and positive charge qdistributed evenly along its circumference. a)what is the direction of the electric field at any point on the z axis? . b)what is the magnitude of the electric field along the positive z axis? use k in your answer, where k=14πϵ0. d)the ball will oscillate along the z axis between z=d and z=−d in simple harmonic motion. what will be the angular frequency ω of these oscillations? use the approximation d≪a to simplify your calculation; that is, assume that d2+a2≈a2. express your answer in terms of given charges, dimensions, and constants