How Do You Solve Physics Problem MASS 7.1?

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Homework Help Overview

The problem involves analyzing forces and motion on a frictionless ramp, specifically focusing on a box with a mass of 7.1 kg. Participants are discussing how to derive acceleration and forces from a velocity vs time graph, as well as applying Newton's laws to the scenario.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning, Problem interpretation

Approaches and Questions Raised

  • Participants are attempting to determine acceleration from a graph and are questioning the forces acting on the box. There is discussion about resolving forces into components and the implications of the normal force in relation to the gravitational force.

Discussion Status

Some participants have provided guidance on how to approach the problem, including suggestions to draw a free body diagram (FBD) and consider the components of forces. However, there is no explicit consensus on the correctness of the calculations or assumptions being made.

Contextual Notes

There is a noted discrepancy regarding the mass of the box, with emphasis on the correct value being 7.1 kg rather than 7.6 kg. Participants are also grappling with the implications of the net force being zero along the y component.

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Homework Statement



The problem is in the attachment.

Homework Equations


The Attempt at a Solution



I didn't know how to answer this after trying many times. Please tell how to answer this question. How to approach it, please.

MASS IS 7.1 NOT 7.6.
 

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You have a graph of velocity vs time.
Can you find the acceleration of the box from this graph? Yes you can.
Can you find the force acting on the box from the acceleration. Again yes.
Do you know of any other forces acting on the box? ie draw a FBD.
Resolve your force(s) into x and y components and compute.
remember -- > frictionless ramp.
 
Okay.

So I found that the acceleration is -2.5 m/s2. I then found that the theta (angle) is 14.47, which is, according to the site, true. Since the net force along the y component is 0 N, then according to Newton's law, N - mgsin@ = 0. (@ is theta). N is then 17.38 N.

However, it is wrong according to the site. Anything wrong?

Oh, and the mass is 7.1 not 7.6.
 
Would not the force along the x-axis be mgsin@? And that is the force that slows the box down.
If you drew the FBD, the normal force, N, would then be what.
 

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