- #1
Charlotte Myall
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I am not looking for an answer, just a method that gives me a result close to 1871.88. I have tried this for hours and when I entered that value it says it is wrong but by a small amount. Please, can someone help me as soon as possible, the assignment is due at 9pm tonight.
1. Homework Statement
You are designing a delivery ramp for crates containing exercise equipment. The crates of weight 1490 N will move with speed 2.0 m/s at the top of a ramp that slopes downward at an angle 21.0 ∘. The ramp will exert a 533 N force of kinetic friction on each crate, and the maximum force of static friction also has this value. At the bottom of the ramp, each crate will come to rest after compressing a spring a distance x. Each crate will move a total distance of 8.0 m along the ramp; this distance includes x. Once stopped, a crate must not rebound back up the ramp.
The question: Calculate the maximum force constant of the spring kmax that can be used in order to meet the design criteria
Work=Force*distance
Kinetic Energy=0.5*mass*velocity^2
Work=change in KE
Force=K(spring constant)*x(distance)
0.5*mass*velocity^2 = 0.5*force*x^2 (distance)
F=kx=mgsin(theta)+friction
F=kx=mgsin(theta)+friction
F=1490*sin(21)+533=1066.97
0.5*m*v^2=0.5*Fx
*2
m*v^2=Fx
m=1490/9.8=152.04
x=mv^2/F
x=152.04*2^2/1066.97
x=0.57
k=F/x
k= 1066.97/0.57= 1871.88
1. Homework Statement
You are designing a delivery ramp for crates containing exercise equipment. The crates of weight 1490 N will move with speed 2.0 m/s at the top of a ramp that slopes downward at an angle 21.0 ∘. The ramp will exert a 533 N force of kinetic friction on each crate, and the maximum force of static friction also has this value. At the bottom of the ramp, each crate will come to rest after compressing a spring a distance x. Each crate will move a total distance of 8.0 m along the ramp; this distance includes x. Once stopped, a crate must not rebound back up the ramp.
The question: Calculate the maximum force constant of the spring kmax that can be used in order to meet the design criteria
Homework Equations
Work=Force*distance
Kinetic Energy=0.5*mass*velocity^2
Work=change in KE
Force=K(spring constant)*x(distance)
0.5*mass*velocity^2 = 0.5*force*x^2 (distance)
F=kx=mgsin(theta)+friction
The Attempt at a Solution
F=kx=mgsin(theta)+friction
F=1490*sin(21)+533=1066.97
0.5*m*v^2=0.5*Fx
*2
m*v^2=Fx
m=1490/9.8=152.04
x=mv^2/F
x=152.04*2^2/1066.97
x=0.57
k=F/x
k= 1066.97/0.57= 1871.88