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3. A force of F(x)=x -cos(3x) +2, X is in meters, acts on an object. What is the work required to move the object from x=3 to X=7? 4. A spring has a natural length of 18 inches and a force of 20 lbs is required to stretch and hold the spring to a length of 24 inches. What is the work required to stretch the spring from a length of 21 inches to a length of 26 inches? 5. Suppose that a water tank is shaped like a right circular cone with the tip at the bottom, and has height 10 meters and radius 2 meters at the top. If the tank is full, how much work is required to pump all the water out over the top? 6.0 A force of 20 lb stretches a spring from a natural length of 7 inches to a length of 12 inches. How much work was performed in stretching the spring to this length? 7.0 A cylindrical storage tank with a radius of 10 ft and a height of 30 ft is filled with water, which weighs approximately 62.4 lb/f13. Compute the amount of work performed by pumping the water up to a point 5 feet above the top of the tank.1. Determine the hydrostatic force on the following triangular plate that is submerged in water as shown. waters surface 6m 4m 2. Find the hydrostatic force on the plate submerged in water as shown in the image below. 7