How many meters above the ground would a person ( 182 lb ) have to climb to gain 3 kilojoules ( 3000 joules ) of potential energy. We usually measure our weight ( W = mg ) in pounds. For conversions, you may need to know that 1 pound is equal to 4.448 Newtons.
2006-10-04 15:33:19 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Physics
The formula for potential energy is PE=mgh, so convert the lbs to newtons and plug it in for mg, and set PE equal to 3000 joules. Then solve for h and you have your answer.
Hope this helps!! :)
2006-10-04 15:45:58 · answer #1 · answered by cushdogjr 3 · 0⤊ 0⤋
Gravitational potential energy is equal to m*g*h.
Converting pounds into Newtons as you mentioned gives a weight of 182*4.4 = 800.8 N. This is the m*g part of the above equation.
Since we want 3000 Joules, set m*g*h = 3000 and solve for h.
800.8*h = 3000. h= 3.75 meters.
2006-10-04 22:46:10 · answer #2 · answered by Kevin R 2 · 0⤊ 0⤋
3000=182*4.448*h
h=3.7 meters
2006-10-04 23:34:27 · answer #3 · answered by bruinfan 7 · 0⤊ 0⤋