Evaluate the magnitude of the gravitational field at the surface of the planet

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Homework Help Overview

The problem involves evaluating the magnitude of the gravitational field at the surface of a planet, based on the trajectory of a rock thrown from a height with an initial speed. The context includes analyzing a graph that depicts the rock's motion, with no atmospheric effects considered.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the use of gravitational equations but question the availability of necessary parameters like the planet's mass and radius. There are attempts to measure acceleration from the graph and to derive equations based on the rock's trajectory. Some participants suggest using the graph to find initial velocity components and angles, while others express confusion about interpreting the graph and applying the equations correctly.

Discussion Status

The discussion is ongoing, with various participants providing insights and suggestions on how to approach the problem. Some guidance has been offered regarding measuring angles and using kinematic equations, but there is no clear consensus on the correct interpretation of the graph or the values needed for calculations.

Contextual Notes

Participants note the challenge of extracting information from the graph, including the initial angle and the distances involved. There is uncertainty about the correct values for the gravitational field and the parameters needed for calculations, leading to a lack of resolution in the discussion.

  • #31
Look at the graph. The gradient of the curve initially is delta x/ delta y =(20-10)/(10-0).
 
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  • #32
aim1732 said:
Look at the graph. The gradient of the curve initially is delta x/ delta y =(20-10)/(10-0).

I just submitted the answer -2.30 and it's INCORRECT! Please help!
 
  • #33
huybinhs said:
I just submitted the answer -2.30 and it's INCORRECT! Please help!

It's all about the sign. Thanks so much for your help aim1732 and tiny-tim! I really appreciate it ;)
 

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