New Horizons Sends A Sharper Images of Ultima Thule

[DNMock]

We're assuming two spheres with 7km radius (which is approximately the correct dimensions, Ultimate is a little larger with diameter 19km (radius 9.5km).
F = G*m1*m2/r^2
You multiply one mass by the other, so if you use identical masses you should see a squared show up, not a multiply by 2. "r" in that equation is the distance between the two masses. When you are caculating the force to an object that you are not inside of you treat it like a point and use the center of mass as where that point is.

Roll with me here, I'm a little dense. Notations are for me, not for you btw.

You have object A with a diameter of 7km, so it's radius is 3.5 km
assuming mass of 2750 kg/m^3
formula would be 4/3 x pi x 3500^3 (radius cubed) x 2750 (mass)
=
157,208,333,332,940.3 kg

so

(157208333332940.3 x 157208333332940.3) / 7000^2 (distance between the center of mass for both objects) all multiplied by 6.673×10-11 (gravitational constant, had to google it)

= 336570596005.2615 newtons

divide by 9.81 to get KG's and multiply by 2.2 to get lbs and you get

75,479,644,364.07496 lbs of weight on earth at sea-level pushing in on you.


Did I get that right or am I failing at physics here?

 

[serpretetsky]

Roll with me here, I'm a little dense. Notations are for me, not for you btw.

You have object A with a diameter of 7km, so it's radius is 3.5 km
assuming mass of 2750 kg/m^3
formula would be 4/3 x pi x 3500^3 (radius cubed) x 2750 (mass)
=
157,208,333,332,940.3 kg

so

(157208333332940.3 x 157208333332940.3) / 7000^2 (distance between the center of mass for both objects) all multiplied by 6.673×10-11 (gravitational constant, had to google it)

= 336570596005.2615 newtons

divide by 9.81 to get KG's and multiply by 2.2 to get lbs and you get

75,479,644,364.07496 lbs of weight on earth at sea-level pushing in on you.


Did I get that right or am I failing at physics here?

I think all your math looks correct. But we are assuming each sphere has 7km radius not diameter.

 

[DNMock]

I think all your math looks correct. But we are assuming each sphere has 7km radius not diameter.

Aaaah i found my biggest blunder here i think.

from the headline "the large circular feature, about 4 miles (7 kilometers) across" read that and assumed the larger of the two balls had a 7 km dia. but after a quick re-read they were referring to a crater. My bad, and ty for grading my maths