1. How much work would it take for a 75kg person to climb the9000meters from sea

Question

1. How much work would it take for a 75kg person to climb the9000meters from sea level to the peak of Mt. Everest? How muchpotential energy would this person have when he or she reached thesummit? Show all calculations.
Here's a question that I did and want to know if I got theanswer correct:
Using and inclined plane which is only 50% efficient, what isthe total work input required to lift a weight of 100N a distanceof 10m? The choices are: a. 2000J, b. 1000J, c. 5000J, d. none ofthese.
I chose b. 1000J. I divided 100N/10m toget that answer. Am I correct?
Thanks! Joanne
Here's a question that I did and want to know if I got theanswer correct:
Using and inclined plane which is only 50% efficient, what isthe total work input required to lift a weight of 100N a distanceof 10m? The choices are: a. 2000J, b. 1000J, c. 5000J, d. none ofthese.
I chose b. 1000J. I divided 100N/10m toget that answer. Am I correct?
Thanks! Joanne

Explanation / Answer

In order tocalculate the work done by the climbers clime to the summit, youmust calculate force*distance
W=F*d
W=75kg*9000m
W=675000 kg*m but to get the answer in newtons, you must includegravity
W=6.622e6 NM
The potential energy at the top of the summit is 0 since you havereached the summit.

For the second part where you already answered, you answeredincorrectly. You do simply multiply 100N*10m to get 1000J,but the question states that the work is 50% efficient, thereforeyou must find define the work done as 100% by multiplying by 2.
Therefore W=2000J

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