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# Calculate the change in potential energ of a 85.8 kg man when he takes an elevator from the first floor to 46th floor, if the istance between floors...

Calculate the change in potential energy of a 85.8 kg man when he takes an elevator from the first floor to 46th floor, if the distance between floors is 4.53 m.

The change of potential energy of man... View the full answer

• how com Yf be 46*4.53..?
• flynn2179
• Apr 04, 2018 at 9:50am
• each floor has a height of 4.53m, and final position is on the floor n = 46, therefore, Yf = n * 4.53m = 46 * 4.53m = 208m
• Ruben08
• Apr 04, 2018 at 9:54am
• Please correct my concept: if you are on the first floor you take the height of a ground floor( which is below you), so if you are on the 46th floor, you have to take the height of 45 floors under you , I have taken foot as the reference point.
• flynn2179
• Apr 04, 2018 at 9:59am
• This answer is correct. Thanks!
• albert1007
• Apr 04, 2018 at 10:02am
• each floor has a height of 4.53m, and final position is on the floor n = 46, therefore, Yf = n * 4.53m = 46 * 4.53m = 208m Everything depends on the reference system, it is true that the change occurs in 45 floors, but I take the lowest part of the building as a reference system, therefore the man is initially on 1 floor of the floor, has an initial potential energy , then it reaches the 46th floor where it has a final potential energy. As the potential energy change is requested, subtraction is done
• Ruben08
• Apr 04, 2018 at 10:07am
• Ruben08
• Apr 04, 2018 at 10:08am
• Thanks you Ruben08
• flynn2179
• Apr 04, 2018 at 10:32am

Here, Mass of the man is 85.8 kg g= 9.8 m/s 2 The man is standing on the first floor, initial elevation... View the full answer

• Do post immediately if have any question
• flynn2179
• Apr 04, 2018 at 9:43am
• It tells me that the answer is incorrect.
• albert1007
• Apr 04, 2018 at 9:58am
• Dear student , may be the concept I have used is wrong and Ruben08 is right, Use his concept. Thank You
• flynn2179
• Apr 04, 2018 at 10:00am

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