An object is placed to the left of a convex mirror, such that the object-to-image distance is 140 cm.
find the focal length of the mirror, if the image is 35 cm from the mirror.
explain step by step as i do not know how to do this properly. you!

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!