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)

answer: the correct answer id option(d).

explanation:

snell's law refraction:

the angle of refraction =

the angle of incidence =

refractive index of air = = 1

refractive index of glycerol = 1.47

from the given options, the most closest answer to 63.72° is 65° of option (d).

probably not the "magnets"in the magnet, so to speak, are thought to be electrons orbiting in shells. vurrent loops two sides to the loop