a.
To find the assembly’s force constant.
a.
Answer to Problem 9E
The assembly’s force constant is 7238 lb/inches.
Explanation of Solution
Given information: Subway car springs takes a force of 21,714 lb to compress a coil spring assembly on a New York city Transit Authority subway car from its free height of 8 in. to its fully compressed height of 5 inches.
Calculation:
As per the given problem,
Hence, the assembly’s force constant is 7238 lb/inches.
b.
To find the work done it take to compress the assembly the first half-inch.
b.
Answer to Problem 9E
905 lb-inches work does it take to compress the assembly the first half-inch.
Explanation of Solution
Given information: Subway car springs takes a force of 21,714 lb to compress a coil spring assembly on a New York city Transit Authority subway car from its free height of 8 in. to its fully compressed height of 5 inches.
Calculation:
As per the given problem,
The amount of work it takes to compress the spring for the first half inches is,
And for the second half inches,
Hence, 905 lb-in. work does it take to compress the assembly the first half-inch.
Chapter 8 Solutions
Calculus: Graphical, Numerical, Algebraic: Solutions Manual
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