Applications variation

Question

TheThe length that a hanging spring stretches very directly with the weight placed at the end of the spring if a weight of 15 lb stretches a certain spring 8 in how far will the spring stretch if the weight is increased to 29 lb

Answer 1

This is a common problem which can be solved using unitary method. This method is used when one quantity changes proportionally with another quantity. For example, if 2 pens cost $4, then 6 pens will cost $12.

To solve such problems, you first need to identify the control parameter. In this case, it is weight. Now you can make two columns

Weight SpringStretch

15lb 8 in

1lb 8/15 in

29lb (8/15)*29 = 15.47 in (Answer)