# physics question

• Jun 29th 2013, 08:30 AM
abdulrehmanshah
physics question
Attachment 28696
i solved the part b and got answer as 3.31*10^18
cant figure out part c and d can anyone verify my answer and provide me with the solution for part c and d
• Jun 29th 2013, 08:50 AM
HallsofIvy
Re: physics question
A body moving in a circle, with radius R, with angular velocity $\omega$ can be represented by the parametric equations $x= R cos(\omega t)$, $y= R sin(\omega t)$. Differentiating, the velocity vector is given by $v_x= -\omega R sin(\omega t)$, $v_y= \omega R cos(\omega t)$. Differentiating again, the accelertation is given by $a_x= -\omega^2R R cos(\omega)$, $v_y= -\omega^2 R sin(\omega t)$. And, of course, ma= F which you have from part a.
• Jun 29th 2013, 09:10 AM
Shakarri
Re: physics question
A body orbiting another body in a circle has an acceleration towards the centre of its orbit given by $a_n=\omega^2R$ This acceleration towards the centre is proportional to the force pulling it to the centre.
• Jun 30th 2013, 10:47 PM
abdulrehmanshah
Re: physics question
guys did i get my answer for B right i.e 3.31*10^18 can u tell me that .
• Jul 1st 2013, 11:34 AM
ebaines
Re: physics question
Quote:

Originally Posted by abdulrehmanshah
guys did i get my answer for B right i.e 3.31*10^18 can u tell me that .

Yes - that's correct. Be sure to note that your answer is in newtons.