Universal law of gravity question

AI Thread Summary
To find the distance between the Moon and Earth using the given gravitational force and the mass of the Moon, the gravitational constant is applied in the formula F = G x m1 x m2 / r². The user initially seeks the mass of the Earth to complete the calculation. After determining the mass, the user can substitute all known values into the equation to solve for the distance. The discussion highlights the importance of understanding gravitational equations in physics. Ultimately, the user expresses gratitude for the assistance received.
Rgonzales
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Homework Statement



The question is: What is the distance between the moon and the Earth if the mass of the moon is 7.34 x 10(to the power of 22) kg and the force of attraction between the two is 2.00 x 10(to the power of 20) N?

Mass of the moon = 7.34 x 10(to the power of 22) kg
Attraction = 2.00 x 10(to the power of 20) N
Gravitional constant = -6.67 x 10(to the power of -11) N.m(squared)/kg(squared)
Mass of the Earth = ?
Distance between Earth and moon = ?

Homework Equations



F = G x m1 x m2
r(squared)


The Attempt at a Solution



First, I am pretty sure that i first need to find the mass of the earth. After, i will be able to sub in all the information to get the answer. I just need help to find the mass of the earth. Please help me.
 
Physics news on Phys.org
Just Google "mass of earth".
 
got it. thank you
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
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Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
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