Physics education research, electronic materials, and the musings of Christopher Moore, Ph.D.
Physics education research, electronic materials, and the musings of Christopher Moore, Ph.D.
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I asked this in the other forum threa, but figured i would ask it here. if anyone could tell/show me how to work this, i would be greatful!
physics 101 question.
An object of mass m is dropped from rest from a height h = 5,000 km. In the absence of friction, what is its speed just before it strikes the ground?
Solve this problem using conservation of energy using two different methods. In method 1, assume that U= mgh. In method 2, assume that , U= -GMm/r =-GMm/R+h where R is the radius of the earth.
Why are your results not the same? Which answer is correct?
Repeat for h = 1 km. In this case, make sure you use enough digits in your calculation.
Thanks for any help!!
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bama1 wrote:
I asked this in the other forum threa, but figured i would ask it here. if anyone could tell/show me how to work this, i would be greatful!
Please don't post the same question in multiple forums. (See #13 here.)
physics 101 question.
An object of mass m is dropped from rest from a height h = 5,000 km. In the absence of friction, what is its speed just before it strikes the ground?
Solve this problem using conservation of energy using two different methods. In method 1, assume that U= mgh. In method 2, assume that , U= -GMm/r =-GMm/R+h where R is the radius of the earth.
Why are your results not the same? Which answer is correct?
Repeat for h = 1 km. In this case, make sure you use enough digits in your calculation.
Thanks for any help!!
See the second bullet point here.
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