Sorry.. I think I posted this post already but I can't find the original thread..(adsbygoogle = window.adsbygoogle || []).push({});

Problem:

Two spheres of masses m = 1.00 g and m' = 1.00 * 10^2

kg are isolated from all other bodies and are initially at

rest, with their centers a distance r = 15.0 cm apart. One

minute later, the smaller sphere has moved 0.534 mm

toward the larger sphere. Compute the acceleration and

the value of G.

Solution:

Acceleration: x = xi + Vxi(t) + (a)(t^2)/2

0.149m = a(1s)^2/2

a = (0.149m)(2) = 0.3 m/s/s

Is this correct for acceleration?

Could I have also used newtons second law some how to solve for acceleration?

such as....

F = (m1)(m2)(G)/.149^2 = 2.98*10^-11

F = F1.... 2.98*10^-11 = (m1)(a)

a = 2.98*10^-11/m1 = 2.9*10^-7

But obviously these answers are not the same....

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# Homework Help: Determinging Gravity

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