D Đ 1199 1. The diagram below shows a system that is in equilibrium. Ocm 10 cm 50 cm 75 cm 100 cm 0.050 kg pivot mass cube a) State two conditions satisfied by the system in equilibrium. [2) b) Use the principles of moments to determine the mass of the cube that is at 75 cm mark of the rule. 14 2. A large jug containing 1.5 kg of water is placed in the freezer. The water cools from 25 °C to 0°C in a time of 60 minutes. The specific heat capacity of water is 4.2 / (g °C). a) Calculate the thermal energy (heat) removed from the water as it cools from 25°C to 0 °C b) Describe the arrangement and the movement of th [3]​