Question

(a) A spring of natural length 5 ft, has a spring constant $k = 70$ lb/ft. Set up, (But Do Not Evaluate) an integral to find the work done in stretching the spring from 6 ft to 8 ft long. (b) A force of 20 pounds stretches a spring 9 inches in an exercise machine. Set up, (But Do Not Evaluate) an integral to find the work done in stretching the spring 12 inches from its natural length. (c) A force of 10 lb is required to hold a spring stretched $\frac{1}{3}$ ft beyond its natural length. Set up, (But Do Not Evaluate) an integral to find the work done in stretching it from its natural length to $\frac{1}{2}$ ft beyond its natural length.

          (a) A spring of natural length 5 ft, has a spring constant $k = 70$ lb/ft. Set up, (But Do Not
Evaluate) an integral to find the work done in stretching the spring from 6 ft to 8 ft long.
(b) A force of 20 pounds stretches a spring 9 inches in an exercise machine. Set up, (But Do Not
Evaluate) an integral to find the work done in stretching the spring 12 inches from its natural
length.
(c) A force of 10 lb is required to hold a spring stretched $\frac{1}{3}$ ft beyond its natural length. Set up, (But
Do Not Evaluate) an integral to find the work done in stretching it from its natural length to
$\frac{1}{2}$ ft beyond its natural length.

(a) A spring of natural length 5 ft, has a spring constant k = 70 lb/ft. Set up, (But Do Not
Evaluate) an integral to find the work done in stretching the spring from 6 ft to 8 ft long.
(b) A force of 20 pounds stretches a spring 9 inches in an exercise machine. Set up, (But Do Not
Evaluate) an integral to find the work done in stretching the spring 12 inches from its natural
length.
(c) A force of 10 lb is required to hold a spring stretched (1)/(3) ft beyond its natural length. Set up, (But
Do Not Evaluate) an integral to find the work done in stretching it from its natural length to
(1)/(2) ft beyond its natural length.

Added by Elizabeth B.

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