Question

The length that a hanging spring stretches varies directly with the weight placed at the end of the spring. If a weight of 11lb stretches a certain spring 7in., how far will the spring stretch if the weight is increased to 44lb ?

Answer 1

Answer:

28 inches

Explanation:

Force is directly proportional to the stretched length

F ∝ d

11 ∝ 7    ... (1)

Let it is stretched by r

44 ∝ r     ... (2)

Divide equation (2) by equation (1), we get

44 / 11 = r / 7

4 x 7 = r

r = 28 inches