Problem: A pot absorbs 4.6 kJ + 4.3 kJ of heat from the stove and loses 21.1 kJ = 12 kJ of heat into the surrounding air. Find the net gain of heat energy for the pot and estimate its uncertainty.
Problem: A falling rock has a mass of 0.082 kg and a speed of 27.1 m/s. What value and uncertainty would you report for the momentum?