Consider a 25-kg system that has been lifted to a height of 2.0 m. If placed in a calorimeter with an equivalent mass of water of 1500 gr. and at an initial temperature it is 20 C. Determine the final temperature that the water will reach if all the mechanical work is converted to heat. (Specific heat of water c = 4.18 X103 J/kg K). 2. Consider an unknown metal which has a mass of 25 grams, this metal is heated to a temperature of 85 C and then introduced into a calorimeter containing 50 grams of water at 16.5 C. After a given time, the calorimeter thermometer has an equilibrium temperature of 19.5 C. What is the specific heat of the unknown metal? 3. An object is dropped from a height of 50 meters starting from rest, what is its final speed just before hitting the ground using the principle of conservation of energy? What is the time it takes to fall? 4. A worker pulls a box and the rope with which he pulls it makes an angle of 400 with respect to the ground if he applies a force of 400 N to move it and moves it a distance of 60 meters, determine the work done by it