Calculate the total mass of the galaxy lying within 20 kpc of the galactic center if the (circular) rotation speed at that radius is 240 km/s. (8 points) if the velocity increases with distance linearly, how does mass distance?

10 points! will mark brainiest! in a heat engine if 1,000 j of heat enters the system and the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2,000 j 1: write the equation2: list out your known variables 3: plug the numbers into the equations 4: solve 5: write your solution statement that includes initial energy and final energy added you so much!