Based on paragraph 4 of the book review, how does the reviewer characterize the author's typical style? a) suspenseful b) scary c) humorous d) serious

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

Is a pencil falling to the floor anon contact force, a force, or a contact force

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