object of size 7.0 cm is placed at 27 CM in front of a concave mirror of focal length 18 cm at what distance from the mirror should a screen be placed so that a shaft forecast image can be obtained find the size and the nature of the image

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!