Which equation represents the law of conservation of energy in a closed system? KEi PEi = KEf PEf PEi PEf = KEi KEf KEi – KEf = PEi – PEf KEi – PEf = PEi – KEf

What does a triple-beam balance require the user to do? add the numbers from the three sliders to determine the mass of an object multiply the numbers from the three sliders to determine the mass of an object add the numbers from the three sliders to determine the volume of an object multiply the numbers from the three sliders to determine the volume of an object