Heat naturally flows from an object that has a temperature to an object that has a temperature. Heat can be made to flow in the reverse direction if is done. A machine can never have an efficiency of . This means that heat energy can never be fully converted into energy.

Heat naturally flows from an object that has a high temperature to an object that has a lower temperature. Heat can be made to flow in the reverse direction if work is done. A machine can never have an efficiency of 100%. This means that heat energy can never be fully converted into mechanical energy energy.

Explanation: This is all derived from the Principles of the Second Law of Thermodynamics.

explanation:

an enlarged virtual image is the answer

i think it’s a. this is because if they measured the mass of something with a mass of 150g, then their final answer would have to be approximately 150g. though all of their answers are almost 150, rosa and tran have the closest answers (or the exact answer) to the accurate one.