Planet Y has a radius 4 times that of Earth but the same mass. What is the strength of the gravitational field on its surface?

(1) 4g
(2) 16g
(3) 1/4g
(4) 1/16g

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!