The final radius of a protostar r2 is a function of its mass and initial radius r1: gm where-b-4.5 ev and ε,-13.6ev a. from the expression of the jeans mass and jeans radius, derive an expression for the jeans density. for a jeans density of 10-16kg. m-3 plot the initial radius of protostars between 0.2 and 2 solar masses on a different graph, plot the final radius of the same protostars. b. c.

Janelle made a hypothesis bout the uneven temperatures inside her house during winter. she believes that 50% of the ducts are blocked and she plans to investigate. if she wants to prove her hypothesis using scientific processes what should she do next?

Agas contained within a piston-cylinder assembly undergoes three processes in series: process 12: compression with pv= constant from 1 bar and 1 liter to 4 bar. process 23: constant pressure expansion to 1 liter. process 31: constant volume calculate the pressure and volume at each state, and sketch the processes on a p-vdiagram labeled with pressure and volume values at each numbered stat

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.