Test II. Problem Solving. Answer the following items. Use additional sheets of paper when necessary. Provide with the Free Body Diagram and strictly follow the GRESA. 1. An object with a mass of 34 kg falls from the rest from the top of a building. At one instance of its flight, it encounters an air resistance of 312 N. (a) What is its acceleration at this instance? (b) What must be the value of air resistance for the object to attain its terminal velocity? (c) What is its terminal speed if the drag coefficient is 1.2 N-(m/s)"? Assume that air resistance is proportional to the square of velocity. 2. When we write on the board with a piece of chalk, an irritating noise results when the chalk is held at some angles. Yet, this does not happen at any other angles. Why? 3. A block is sliding at a constant speed down a wooden board inclined at an angle of 23" with the horizontal surface. The mass of the block is 6.5 kg. Find the (a) coefficient of kinetic friction and (b) kinetic friction. (c) Explain what would happen if the board is lubricated so that friction is reduced to 75 percent. 4. Why are motorcycle riders required to wear helmets? 5. A Christmas decoration consists of three identical balls, each with a mass of 0.15 kg. It was hung from a ceiling as shown in the figure. Find the tension in the portion of the string supporting each ball. Neglect the mass of the string