¿A qué altitud una persona pesará la mitad de lo que pesa sobre la superficie de la Tierra?

2639 m

Explanation:

The weight of a person is given by

where

m is the mass of the person

g is the acceleration due to gravity

The acceleration due to gravity is given by

where

G is the gravitational constant

M is the Earth's mass

r is the distance from the Earth's centre

So the weight can be rewritten as

At the Earth's surface,

r = R (Earth's radius), so

(1)

Then we wand to find the altitude at which the weight is half of this value:

This happens at a certain r' such that

(2)

By replacing (1) into (2),

We can rewrite r' as

where h is the altitude of the person. So,

And substituting the value of the Earth's radius,

we find

coil wire, increase current, put iron inside the coil

potential energy is directly proportional to height.

more height = more potential energy.

greatest increase in height = greatest increase in potential energy

where are the points with the greatest increase in height ?

has to be c-e or d-e .