Box lifted off the ground by a tension force at a 32 degree angle

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Homework Help Overview

The problem involves analyzing the forces acting on a box being lifted off the ground by a tension force at a 32-degree angle. The objective is to determine the magnitude of the force F at the moment the block loses contact with the floor.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the balance of forces, particularly focusing on the tension force and its components. Questions arise regarding the notation used for the tension force and its representation in equations. There is also an exploration of the conditions under which the box loses contact with the ground.

Discussion Status

Some participants have identified errors in their reasoning and calculations, leading to a revised understanding of the problem. There is acknowledgment of a correct answer by one participant, but the discussion continues to explore the underlying concepts and assumptions.

Contextual Notes

Participants are working within the constraints of a homework assignment, which may limit the information they can use or the methods they can apply. The discussion reflects a process of clarification and correction rather than a straightforward solution.

isukatphysics69
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1. Homework Statement

The magnitude of the force F is slowly increased. The direction of the force remains the same. What is the magnitude of the force F at the moment the block looses contact with the floor?

Homework Equations


fnet=m*a[/B]

The Attempt at a Solution


fnety = tensionforcesin(32)-mg+fnormal
since box being lifted off ground fnormal = 0
since instantaneous acceleration is still 0 so 0=tensionforcesin(32)-24.01+0
24.01/sin32 = tensionforceydirection
tensionforceydirection = 45.31
plug this force into x component
fnetx = 45.31cos(32)
fnetx = 38.42
force mag = sqrt((38.42)^2+(45.31)^2))

incorrect answer
not sure what i am doing wrong here?
 

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isukatphysics69 said:
0=tensionforcesin(32)-24.01+0
24.01/sin32 = tensionforceydirection
What happened here? In one equation you have the tension force (why don't you call it T or something more tangible?) and in the other its y-component.
 
OK I JUST THOUGHT DEEPLY ABOUT IT AND REALIZED WHAT I DID WRONG AND GOT THE CORRECT ANSWER 45N
 
Orodruin said:
What happened here? In one equation you have the tension force (why don't you call it T or something more tangible?) and in the other its y-component.
hi yes i realized what i was doing wrong the answer is 45N
 

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