Attraction and gravitational force.

fineztpaki
Messages
13
Reaction score
0

Homework Statement


Two objects attract each other gravitationally with a force of 2.7 10-10 N when they are 0.25 m apart. Their total mass is 4.0 kg. Find their individual masses.
larger mass - I kind of guessed this was 4.0 kg but don't know how to do it.
smaller mass ? kg


The Attempt at a Solution



I don't quite understand how exactly this must be done. What formulas would i use?
 
Physics news on Phys.org
Use Newton's Law of Gravity. (No guessing allowed!)

Call the masses M1 and M2, if you like.
 
ahh.. i still don't get it?
 
take two masses M1 and M2. problem says that M1+M2= 4.
Newton's law of gravitation says that force between two objects of mass M1 and M2 is

F = (gravitational constant) x (M1) x (M2) / (square of the distance)

so u know F, gravitational constant, the value of distance. Substitute these values in the above equation, u going to get a relation beween M1 and M2 something like ,
M1= something times M2

substiute that in M1 + M2 = 4,
probably u get the answer.
 
thanks
 
Hello everyone, I’m considering a point charge q that oscillates harmonically about the origin along the z-axis, e.g. $$z_{q}(t)= A\sin(wt)$$ In a strongly simplified / quasi-instantaneous approximation I ignore retardation and take the electric field at the position ##r=(x,y,z)## simply to be the “Coulomb field at the charge’s instantaneous position”: $$E(r,t)=\frac{q}{4\pi\varepsilon_{0}}\frac{r-r_{q}(t)}{||r-r_{q}(t)||^{3}}$$ with $$r_{q}(t)=(0,0,z_{q}(t))$$ (I’m aware this isn’t...
Hi, I had an exam and I completely messed up a problem. Especially one part which was necessary for the rest of the problem. Basically, I have a wormhole metric: $$(ds)^2 = -(dt)^2 + (dr)^2 + (r^2 + b^2)( (d\theta)^2 + sin^2 \theta (d\phi)^2 )$$ Where ##b=1## with an orbit only in the equatorial plane. We also know from the question that the orbit must satisfy this relationship: $$\varepsilon = \frac{1}{2} (\frac{dr}{d\tau})^2 + V_{eff}(r)$$ Ultimately, I was tasked to find the initial...
Back
Top