Homework Help: Physics

Posted by Brandon on Sunday, November 2, 2008 at 11:30am.

When an 81.0 kg adult uses a spiral staircase to climb to the second floor of his house, his gravitational potential energy increases by 2.25 103 J. By how much does the potential energy of a 17.0 kg child increase when the child climbs a normal staircase to the second floor?
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Physics - drwls, Sunday, November 2, 2008 at 11:38am
It makes no difference of the staircase is spiral or "normal". What matters is the top to bottom elevation change.

The PE gain will be proportional to the person's mass.

Mulltiply 2.25*10^3 J by 17/81 (the mass ratio) and you will get the child's PE change
Physics - Anonymous, Monday, December 15, 2008 at 6:09pm
87
Physics - haird, Monday, December 7, 2009 at 1:26pm
Grav PE of the adult = mgh = 2X10^3 J 81gh = 2X10^3 J gh = 2X10^3 / 81 Child's grav PE = mgh = 18 x 2x10^3 /81 = 444.4J

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