Acopper cube weighs 0.25n in air and 0.17n when completwly immersed in paraffin oil and 0.15n when completely immersed in water . what is the ratio of the upthrust in air to the upthrust in water

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!