What is k for the bottom spring?

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Homework Help Overview

The problem involves a 5.0-kg block that is lowered onto a vertical spring, with questions regarding the forces acting on the block and the spring constant of the bottom spring. The discussion centers around the readings of a spring scale and the relationship between force and spring compression.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the interpretation of the force exerted by the block on the spring and whether the scale reading corresponds to that force. There are attempts to clarify the forces acting on the block and how they relate to the spring constant.

Discussion Status

The discussion is active, with participants questioning each other's interpretations and calculations regarding the forces involved. Some guidance is offered in the form of suggestions to draw diagrams to visualize the forces, but no consensus has been reached on the correct approach to determining the spring constant.

Contextual Notes

Participants are navigating through the implications of the scale reading and the gravitational force acting on the block, while also considering the compression of the spring. There is an emphasis on understanding the net forces and their directions.

emily081715
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Homework Statement


A 5.0-kg block suspended from a spring scale is slowly lowered onto a vertical spring.
Part A: What does the scale read before the block touches the vertical spring?
(answer =49.1N)
Part B: If the scale reads 32 N when the bottom spring is compressed 30 mm, what is k for the bottom spring?

Homework Equations


F=kx

The Attempt at a Solution


K=32/0.03= 1066.7N/m
 
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So would 32 N be the force the block exerts on the bottom spring ?
 
BvU said:
So would 32 N be the force the block exerts on the bottom spring ?
thats what i interpret from the question, is that not correct?
 
If the scale reads 32 N, and ##g## times the mass is 49.1 N ...
Draw a diagram of the forces on the block.
 
BvU said:
If the scale reads 32 N, and ##g## times the mass is 49.1 N ...
Draw a diagram of the forces on the block.
Both forces are acting down so would it be (32+49.)1/0.03=2703
 
The scale is pulling the block up
The bottom spring is pushing the block up
The Earth is pulling the block down
Fnet = ma and the block is not accelerating
 
BvU said:
The scale is pulling the block up
The bottom spring is pushing the block up
The Earth is pulling the block down
Fnet = ma and the block is not accelerating
Would it still not be what I did earlier
 
No.
 
BvU said:
No.
why? what is the mistake, should the forces be subtracted
 
  • #10
upload_2016-11-1_20-13-51.png
Draw the forces the scale and the spring exert. Which way do they point ?
 

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