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can someone please help me with these problems? i'm completely lost.

1. Synchronous communications satellites are placed in a circular orbit that is 2.32 x 107 m above the surface of the earth. What is the magnitude of the acceleration due to gravity at this distance?

2. A woman stands on a scale in a moving elevator. Her mass is 62.2 kg, and the combined mass of the elevator and scale is an additional 836 kg. Starting from rest, the elevator accelerates upward. During the acceleration, the hoisting cable applies a force of 9110 N. What does the scale read during the acceleration?

for number 2:

i think i use the equation Fn=mg+ma. for m do i use the total mass or just the woman's mass? g is 9.8 right? but i don't know what the accerlataion is cause the problem doesn't say.

for number 1:

i tried using the law of universal gravitation but that was wrong. i don't know how to find the acceleration with the information given. i know the mass of earth and the radius. but i don't know how to use the info.

the hw is due at 11 pm which is in 5 hours. and i don't have any idea how to solve it. any help would be great. thanks

1. Synchronous communications satellites are placed in a circular orbit that is 2.32 x 107 m above the surface of the earth. What is the magnitude of the acceleration due to gravity at this distance?

2. A woman stands on a scale in a moving elevator. Her mass is 62.2 kg, and the combined mass of the elevator and scale is an additional 836 kg. Starting from rest, the elevator accelerates upward. During the acceleration, the hoisting cable applies a force of 9110 N. What does the scale read during the acceleration?

for number 2:

i think i use the equation Fn=mg+ma. for m do i use the total mass or just the woman's mass? g is 9.8 right? but i don't know what the accerlataion is cause the problem doesn't say.

for number 1:

i tried using the law of universal gravitation but that was wrong. i don't know how to find the acceleration with the information given. i know the mass of earth and the radius. but i don't know how to use the info.

the hw is due at 11 pm which is in 5 hours. and i don't have any idea how to solve it. any help would be great. thanks

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