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#1
08-07-2007, 03:27 PM
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Re: Need help devising an easy physics question that sounds really har
[ QUOTE ]
I'm more interested in how you measure total force in Joules. [/ QUOTE ] Me too. I'm not sure whether he's asking for the average force that operated on the dalmatian as it was being slowed down by the Jello, or the total energy absorbed by the jello. Either way it's not a difficult problem, but I don't think he even knows what he is asking. 
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#2
08-07-2007, 03:29 PM
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Re: Need help devising an easy physics question that sounds really har
[ QUOTE ]
[ QUOTE ] I'm more interested in how you measure total force in Joules. [/ QUOTE ] Me too. I'm not sure whether he's asking for the average force that operated on the dalmatian as it was being slowed down by the Jello, or the total energy absorbed by the jello. Either way it's not a difficult problem, but I don't think he even knows what he is asking. [/ QUOTE ] Yes, I assumed it was the 2nd case, but the correct answer is 6000 joules not 400 (30 meters total displacement x 20kg x 10m/s^2).
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#3
08-07-2007, 03:37 PM
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Re: Need help devising an easy physics question that sounds really har
[ QUOTE ]
[ QUOTE ] [ QUOTE ] I'm more interested in how you measure total force in Joules. [/ QUOTE ] Me too. I'm not sure whether he's asking for the average force that operated on the dalmatian as it was being slowed down by the Jello, or the total energy absorbed by the jello. Either way it's not a difficult problem, but I don't think he even knows what he is asking. [/ QUOTE ] Yes, I assumed it was the 2nd case, but the correct answer is 600 joules not 400 (30 meters total displacement x 20kg). [/ QUOTE ] You're forgetting about the acceleration of gravity. You have to multiply by 9.8m/s^2 to get energy Edit: look like you just noticed that
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