Recent content by Kitten207

thank you so much!

Homework Statement Located here: http://i54.tinypic.com/5vzkll.jpg Homework Equations CM = Σ(m_i)(x_i) x(t)= x_o + (v_ox)t + ½(a_x)t² The Attempt at a Solution Do I have to break it up into components?

I am confused. To find the needed velocity: mgh = 1/2 mv^2 v= sqrt(6gR) because height is 3R. Where do I go from there? What do I use for g?

oh I'm a bit confused on the second part too actually. So: U_i = K_f mgh = ½mv² v= √2gh = √(2)(9.8m/s²)(400m) =7840 m I can't jump that fast...right? Is this correct?

I don't think I understand your first point, but this is what I got for it: U_i = K_f mgh = ½mv² v= √2gh What value do I use for g? Thank you for the other two hints!

bump. Help on just the first part of the problem.

Homework Statement The problem is stated here: http://i53.tinypic.com/2wfl4jm.jpg Please take a look.

Ok I know that escaping means 1/2 mv2 = GMm/R. So for the first part, I'd do Sum Ki + Sum Ui = Sum Kf + Sum Uf? From that, I'll get the velocity? Do I need to use any kinematics equations?

Homework Statement Here is the problem: http://i51.tinypic.com/6r7jts.jpg Homework Equations PE= mgh KE= 1/2mv^2 I'm not sure how to go about this problem =[