8. A spring has a natural length of 10 cm. It takes 2J to stretch the spring to 15 cm. How much work would it take to stretch the spring from 15 cm to 20 cm?

Your basement has flooded. You decide to take an empty gallon container of milk and use it to remove the water from your basement. After filling the container you will take it up 10 steps, that are 1 foot vertically between risers. In your efforts to be quick, you spill 2oz's per step you take. How much work is done to move the 500 gallons of water in your basement. Hint: A gallon of water weights 8lbs and there are 16 oz's in a lb.

A force of 40 lb is required to stretch a spring 2 feet beyond its natrual length. How much work is done in stretching the spring from its natural length to 3 feet beyond its natural length? Use the dropdowns to select your answer and the correct units. Amount of work: ISelect] Units: [Select ]

9. An architect is designing a passive solar house to be located in Terre Haute, Indiana. The diagram shows a cross- section of a wall that will face south. How long must the overhang x be to shade the entire window at noon at the summer solstice? 1 ft 10. If the overhang has the length found in Exercise 9, how much of the window will be in the sun at noon at the Window 6 ft high winter solstice? 74%