Mary weighs 505 N. She walks down a flight of stairs to a level 5.50 m below her starting point. What is the change is Mary's potential energy?
Please help me with this question.
I'm having trouble solving it.
2007-01-26 13:40:36 · 4 answers · asked by swimmertommy 1 in Science & Mathematics ➔ Physics
Potential energy of Mary is decreased so we put negative sign
Change in energy = -m*g*h but mass =505/9.8
= -(505*9.8*5.5)/9.8 Because(Weight = mass *g)
= -2777.5 Joule.
2007-01-26 16:42:26 · answer #1 · answered by Mihir Durve 3 · 2⤊ 1⤋
Mary of course loses potential energy. The work done by Mary as she climbed the stairs is FORCE * DISTANCE moved. Her weight is the force she must overcome and the distance moved is 5.5m. This equals 505*5.5 joules or 2777.5 joules. This is also a measure of the potential energy lost ie) -2777.5 joules as she descends the stairs.
2007-01-30 12:32:32 · answer #2 · answered by lester_day 2 · 1⤊ 1⤋
It really sounds easy: 505*5.5*9.8 Newton-Meters^2/sec^2?
potential energy = mgh
2007-01-26 13:44:34 · answer #3 · answered by firefly 6 · 0⤊ 3⤋
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2016-12-03 02:30:59 · answer #4 · answered by ? 4 · 0⤊ 2⤋