An astronaut weighs 200 lb at sea level. the radius of the earth is 3960 miles. what force is exerted on the astronaut if he is floating 125 miles above the earth's surface?

85.31 N

Explanation:

Given,

Radius of Earth = 3960 miles = 6373 Km

Weight of Astronaut at Sea level = 200lb = 90.72 Kg

Altitude of Astronaut above Earth = 125 miles = 201.17 km

We know that,

--------------------------  (1)

where,

F = force on the object due to gravity also called the weight

m = mass of the object = 200 lb = 90.71 kg

g = acceleration due to gravity = 9.8 m/s²

Also,

-------------------(2)

where,

F = force due to gravity

G = Gravitational constant = Nm²/kg²

M = mass of the Earth =

r = distance between the two objects

here, r = (6373+201.17)km = 6574170 m

From equation (1),

Putting value of m in equation (2)

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

b.a device that inputs heat into a cool object