Work Power Engergy Thrown Toilet Roll Problem

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Homework Help Overview

The problem involves a scenario where a roll of toilet paper is thrown from a height, and participants are exploring the relationship between kinetic and potential energy to determine the speed of the roll upon impact with a player below.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the application of energy conservation principles, questioning the initial and final kinetic and potential energy states. Some express confusion about the calculations and the setup of the problem.

Discussion Status

There is an ongoing exploration of the energy conservation equation, with some participants suggesting the need to consider both initial kinetic energy and potential energy. Questions about the direction of the throw and its impact on the analysis have also been raised, indicating a lack of consensus on how to proceed.

Contextual Notes

Participants note the absence of information regarding the direction of the throw, which may affect the analysis of the problem. There is also a sense of urgency expressed by the original poster for a timely response.

jojo711
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Homework Statement


A pure silver Lions fan throws a roll of toilet paper at 11.0 m/s from her seat at Ford's Field during a recent game. How fast is the 0.4 kg roll going when it strikes an opposition player 17.0 m below?

Homework Equations


1/2mv^2 = mgh <-- i think.

The Attempt at a Solution


I did 1/2mv^2 = mgh and got something like 18.25 and then got totally confused and did not know how to do it. Please help. I am totally lost. thanks please answer in the next 20 mintues and you will receive lots of love. Thanks.
 
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Yes, definitely an energy question! But I think you have oversimplified a bit. Wouldn't it be
Initial KE + initial PE = final KE
 
I did:
mgh+1/2mv^2
and got an answer and I don't know what to do from there.
 
Initial KE + initial PE = final KE
mgh+1/2mv^2 = 1/2mV^2
Fill in the numbers.
 
Which direction are they throwing the roll in?
 
We can find the magnitude of the velocity from the final KE. But not the direction because the initial direction isn't given.
 

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