
#1
Jan2112, 03:23 PM

P: 1

1. The problem statement, all variables and given/known data
If a mass (.5 lb) is pushed down a ramp at a constant unknown force into a spring, compressing it 3 inches, what is the spring constant? 2. Relevant equations Mass: .5lb Time: 3 seconds Length of ramp: 28 inches inital height of ramp: 5.5 inches final height: 0 µ: .52 The ramp angle is 15^{o} to the ground 3. The attempt at a solution I understand that if I set the equation up like this: 1/2mv^{2}_{o} + mgh_{o} + 1/2Kx^{2}_{o} + Wnc = 1/2mv^{2} + mgh + 1/2Kx^{2} And plug in what I know, I will find the answer for the spring constant, But I'm having trouble finding the work of the non conservative forces. and the final and initial velocities. I just need help figuring them out so I can solve for K. Thank you to anyone who helps :) I really appreciate it! 



#2
Jan2112, 10:59 PM

HW Helper
P: 3,394

If the unknown force is large, it will give the mass a lot of energy and the spring will have to be very strong. Or if the force is very small, the spring will be very weak.
The strength of the spring depends on the force and cannot be found without knowing the force. Or something else not given in the question. 


Register to reply 
Related Discussions  
Finding spring constant, damping constant and Q for suspension of a car  Introductory Physics Homework  0  
Energy: Finding Maximum spring constant  Advanced Physics Homework  9  
Finding a spring constant of a spring holding a mass  Advanced Physics Homework  1  
Crates on a Ramp with Friction and a spring at bottom. Finding the spring constant.  Introductory Physics Homework  2  
Elastic Potential Energy finding spring constant  Introductory Physics Homework  3 