2. Construction Structural engineers have found that a good estimate of the crushing load for a square wooden pillar is given by the formula _ 25s\"I _ H2 where L is the crushing lead in tons. T is the thickness of the wood in inches. and H is the height of the post in feet. Find the cmshing load for a 6-in.-thick post 12 ft high. L Manufacturing The length of belt on a roll of conveyor belt material is given by the formula L= arHN where 1': =5 3.14. H is the height of the center core in meters, and N is the number of wraps on the roll. If a particular roll has 18 wraps of belt and the height of the center core is 2.20 meters, what length of belt is on the roll? (Round to the nearest meter.) HVAB In planning a solar energy heating system for a house, a contractor uses the formula Q = 3.33GDT to determine the energy necessary for heating water. In this formula Q is the energy in Btu, G is the number of gallons heated per day, I) is the num- ber of days. and Tis the temperature difference between tap water and the desired temperature of hot water. Find Q when G is 50 gallons, D is 30 davs. and the water must be heated from 60 to 140