The gravitational force of attraction between two students sitting at their desks in physics class is 2.33 10-8 N. If one student has a mass of 47.0 kg and the other student has a mass of 57.0 kg, how far apart are the students sitting?

Please show step by step works, thanks

Quote:

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Originally Posted by sh109695

The gravitational force of attraction between two students sitting at their desks in physics class is 2.33 10-8 N. If one student has a mass of 47.0 kg and the other student has a mass of 57.0 kg, how far apart are the students sitting?

Please show step by step works, thanks

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Hi sh1


You will need to know Newton's universal law of gravitation.

Newton's law of universal gravitation - Wikipedia, the free encyclopedia

this is your equation
Fg = G{m1 m2}/{r^2}

plug in the things that you know.
Fg=2.33e-8
G=6.67e-11
m1=47
m2=57
r=?

make the equation equal to r

r^2=G{m1 m2}/{Fg}

r^2=(6.67e-11*47*57)/2.33e-8

r^2=7.67

take the square root of that number

r=2.77

the distance is 2.77m