A mule uses a rope to pull a box that weighs 145 N across a level surface with constant velocity. The rope makes an angle of 25.0° above the horizontal, and the tension in the rope is 85 N. What is the normal force of the floor on the box?

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?

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!

What does the law of conservation of mass state?