The graphic below shows the stafes in the development of the solar system. Which statement BEST describles the process of the formation of the solar system?

a
Gravity pulled the gas and dust together.
b
A black hole pulled the gas and dust together.
c
An explosion pushed the gas and dust together.

In a heat engine of 1000 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 inital energy was 2000 j we have to do all of these down here 1)write the equation 2)list out your know variables 3)plug the numbers into the equations 4)solve 5)write your solution statemtn that includes inital energuy and final energuy added