Recent content by BlackStar

Thanks i got it now I'd forgotten use the binomial approximation for the small perturbations , so i thought oscillations weren't simple.

tangential acceleration is in the direction of velocity, so the angle between tangential accel and total accel is 20+45=65 degrees. centripetal acceleration is perpendicular to velocity and makes 45-20=25 degrees. so you get 3sin65 and 3sin25 as answers btw tangential and radial are by...

λ= 656.28 nm Δλ=656.28-656.25=.03 nm c=3*108 m/s=3*105 km/s so finally , v=13.7 km/s The units of Δλ and λ cancel, so v has basically same units as c

Consider a spherical star made of N (very large number) particles interacting via gravity.Let the mass of ith particle be mi and position be xi Let ##I= \sum_{i=1}^{N}m_{i}r_{i}##, U be potential energy and K be kinetic energy 1)Show that the virial equation takes the form...