Add the lengths 5.28 meters and 5.2 meters to find the sum. What is the proper way to write the answer suing significant digits and rounding?

Which actions would increase the rate at salt dissolves in water? stir the water? crush the salt? use less water? heat the water? cool the salt

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?

In a heat engine of 1000 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 inital energy was 2000 j we have to do all of these down here 1)write the equation 2)list out your know variables 3)plug the numbers into the equations 4)solve 5)write your solution statemtn that includes inital energuy and final energuy added