Recent content by tkim90

I'm stumped on what seems to be a simple proof question, but I don't know what to do. Question: (c) Show that the LSE of the mean Y0 = B0 + B1x0 is a linear function of the data Yi, for i = 1,2,…,n where x0 is a known constant. Could someone help me to at least start this problem? So...

So that means I need vf for m1 and m2, but that gives me two variables. How can I solve them individually? Do they have the same speed since they are connected? Thanks for the help by the way.

Does m2 have KE as well, or only m1?

OK. So to find PE of m1 before and after, I need the height of m1 before and after. I assumed that xi for m1 is 0.2m Using trigonometry: sin40 = \frac{hi}{0.2meters} hi = 0.13m and hf = 0m Right?

Ok, this is my work: 0.5k(xf)^2 + m2ghf + 0.5m1v^2 = 0.5k(xi)^2 + m2ghi 0.5k(0.4)^{2} + m2g(0.4) + 0.5m1v^{2} = 0.5k(0.2)^{2} + m2g(0.2) + 0 0.5(250)(0.4)^{2} + (30)(9.8)(0.4) + 0.5(20)v^{2} = 5 + 59 20 + 117.6 + 10v^{2} = 64 10v^{2} = -73.6 :/

Homework Statement A 20kg block (m1) slides on a 40 degree frictionless ramp. This block is connected to a 30kg block (m2) by a string that passes over a frictionless pulley. The 30kg block is 20cm above the floor and connected to a spring of negligible mass with spring constant 250N/m...