Please, in desperate need of help!!!
Suppose that planet X had a mass exactly the same as planet Earth. A person weighs 695 N on Earth. What would be the mass (in kg) of the 695-N person on planet X if its radius were 1.85 times greater than that of planet Earth?

Question

Please, in desperate need of help!!!
Suppose that planet X had a mass exactly the same as planet Earth. A person weighs 695 N on Earth. What would be the mass (in kg) of the 695-N person on planet X if its radius were 1.85 times greater than that of planet Earth?

anonymous · Answer

what gives us weight is the gravitational acceleration. You should know that gravitational acceleration proportional to the mass of the planet and inversely to the square of the radius

can u figure out the gravitational acceleration of the planet X using this clue?

mrnood · Answer

You must get the distinction between Mass and Weight clear in your mind.

The MASS of the person does not change between the planets.

I believe your question really is - 'What is the Weight experienced on  the second planet?'.

As Mashy says - this is proportional to 1/r^2.

Since the person is further away from the centre of the planet he will weigh less. Calculate the amount by the inverse square law stated above.