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Welcome to Physics Homework and Study Help, where you can ask questions and receive help on learning physics. We currently focus on helping questions in introductory level college physics and high school AP Physics courses.
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Feel free to ask a question and also answer questions others asked. Answering others' questions can in turn help one's own understanding and build a warm healthy community for learning. The followings list a few things that might be helpful for you to effectively obtain help on specific physics homework or practice problems.  

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energy question

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A student eats a candy that contains 200 kJ of energy. He then applies a horizontal force of 50 N to push a cart. How far could he push the cart if he uses only the energy supplied by the candy?

 

I know E=mc^2, but how does mass/speed of light relate to displacement? I'm confused.
asked Apr 4, 2014 in Highschool Physics by R

1 Answer

0 votes
I think you are confused about the applications of this equation.  It is usually used to explain the phenomenon known as mass defect: (where the observed mass of an atom is actually less than the sum of all of the nucleons present in the atom) due to the conversion of mass to nuclear binding energy.  There are other applications as well...but it is not appropriate to use it for the question stated above.

Rather, you simply need to incorporate the concept of work.

W=Fdcos(ø).  Since the force is horizontal, cosine is equal to 1 and the equation simplifies down to W=Fd.   Work is in units of energy, so simply solve for d which is the displacement of the object.

Hope that helps.
answered Apr 5, 2014 by Biomed94 (1,080 points)
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