[url=http://www.esperimentidifisica.it/phisics_laboratory/Joule/joule.html]http://www.esperimentidifisica.it/phisics_laboratory/Joule/joule.html[/url][b][br][br]How to do[/b][br][list][*]set the mass of the two suspended spheres in kg[br][/*][*]set the mass of water contained in the calorimeter (includes the equivalent mass in water of the calorimeter) in grams[br][/*][*]enter a value by moving the sliders or by entering the numbers in the corresponding boxes[br][/*][*]press the "START" button, suspended objects will be free to fall under the action of gravity;[br][/*][*]at the end of the fall the thermometer will mark a given temperature, greater than the initial one;[br][/*][*]press the "START" button to drop the masses again ;[br][/*][*]press the "RESET" button to reset all the initial conditions;[br][/*][/list][br][b]Proposed activity[/b][br][list=1][*]press the reset button[br][/*][*]record the initial temperature Ti[br][/*][*]drop the spheres n times[br][/*][*]record the final temperature Tf[br][/*][*]calculate the work done: L = 2mgh * n ( we have 2 falling masses and the height h = 2m)[br][/*][*]calculate the product heat : Q =ma (Tf-Ti) * c (c: specific heat of water = 1cal / (g ° C), ma = mass of water + equivalent mass in water of the calorimeter)[br][/*][*]calculate j = L / Q[br][/*][/list][br][b]NOTE[/b][br]mass of spheres  in kilograms[br]water mass in grams[br]sensitivity of the thermometer 0.1 C[br]length of the fall 2m ±1cm