Question 1. Determine the moment created by the weight of the suspended sign about point O. Dimensions of the sign and the support are shown in the accompanying figure. The sign is 2-mm thick and is made of aluminum. The density of aluminum is equal to 2.7 g / cm3 - 4 m Sign $ 1 m W 8 m - 2 m O Page 1 | 6Question 2. Calculate the change in the momentum of a car, whose speed changes from 100 km/h to 20 km/h. The car has a mass of 1000 kg and is moving along a straight line. Express your answer in SI and U.S. Customary units. Question 3. Calculate the weight of all the air in a classroom with the dimensions of 9 m by 10 m by 3m. Assume the density of air to be approximately 1.2"m . Express your answers in both Newton and pound force. Page 2| 6