Reading Outline, x8.5 Vocabulary/De nitions Work Units of work Pressure Understand 1. Suppose a spring that obeys Hooke?s law has a spring constant k = 2 nt/m. If the spring is already compressed x m, how much work is done to compress it an additional x m? How much work is done to compress the spring a total of 0.2 m? 2. Find the work required to build a 300 ft high pyramid with a square base 400 ft by 400 ft. Assume that the density of the stone used to construct the pyramid is 200 pounds per cubic foot. 3. Find the total force on a trapezoidal dam 10 m tall, 20 m across at the top and 10 m across at the bottom.
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