Physics
posted by LD .
as the weight held by a spring increases, the length of the spring increases proportionally. Suppose a 2lb weight stretches a spring to 15 in., and a 12lb weight stretches the same spring to 20 in. What is the length of the spring with no weight attached?

(20x)/(15x) = 12/2 = 6
90  6x = 20  x
5x = 70
x = 14 inches
Respond to this Question
Similar Questions

physics
In a room that is 2.13 m high, a spring (unstrained length = 0.30 m) hangs from the ceiling. A board whose length is 1.58 m is attached to the free end of the spring. The board hangs straight down, so that its 1.58m length is perpendicular … 
Physics
In the parallel spring system, the springs are positioned so that the 44 N weight stretches each spring equally. The spring con stant for the lefthand spring is 3.6 N/cm and the spring constant for the righhand spring is 6.4 N/cm. … 
Physics
A weight stretches one spring 3 in. and a second weight stretches another spring 9 in. If both weights are simultaneously pulled down 1 in. below their respective equilibrium positions and then released, find the first time after t … 
Math
A plumber charges $45 for a service call, plus $70/h for her time. a. Find the cost of a two hour service call. b. How long was a services call that cost $150? 
Math
The distance a spring stretches is directly proportional to the force applied to the spring. A 4lb weight stretches a spring 20 in. A 16lb weight stretches a spring 26 in. Find the length of the spring with no weight attached. 
math
hooke's law determine that if a small weight is suspended from a spring,the length of the stretched spring y, is a linear function of the weight, x. determine the linear equation if the unstretched spring is 12 inch and weight of 2 … 
Math
as the weight held by a spring increases, the length of the spring increase proportionally. suppose a 2lb weight stretches a spring to 15 in., and a 12lb weight stretches the same spring to 20 in. what is the length of the spring … 
College Algebra
Hooke's Law states that the distance a spring stretches is directly proportional to the weight attached to the spring. If a 30pound weight attached to the spring stretches the spring 8 inches, find how much weight is needed to stretch … 
math help please
The distance a spring stretches varies directly with the force applied to it. If a 7pound weight stretches a spring a distance of 24.5 inches, how far will the spring stretch if a 12pound weight is applied? 
i need help
The distance a spring stretches varies directly with the force applied to it. If a 7pound weight stretches a spring a distance of 24.5 inches, how far will the spring stretch if a 12pound weight is applied?