A block is attached to a spring (massless) fixed at one end. A bullet hits the block and embeds itself. Discuss the energy loss. Is the maximum compression of the spring independent of the collision time?
$$ \Delta H = \Delta U + \Delta(PV) $$
Spiral galaxies, like the Milky Way, are characterized by a central bulge and a disk of stars, gas, and dust, with spiral arms of younger stars and star-forming regions. Elliptical galaxies, on the other hand, are egg-shaped and lack a disk, with a higher proportion of older stars and less gas and dust. physics galaxy discussion questions solutions