Papa bless

a skier is skiing down a slope on the mountain. is the mechanical energy conserved? why or why not?

the mechanical energy is conserved. there is as much ke at the end as there was pe at the beginning.

the mechanical energy isn't conserved. some energy is lost to friction.

mechanical energy is always conserved.

the mechanical energy isn't conserved. some energy is lost to gravity.

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 equation 2: 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!