- #1
Bobazoide
- 6
- 0
Homework Statement
A 38kg block is on a slope that is 50 degrees above the horizon. The box is attached to a 9kg weight that rests on a flat surface (connected to the top of the slope). The coefficient of friction for both surfaces is 0.12. Calculate the acceleration of the system.
Homework Equations
Fnet = Fapp - Ff
Fgx = (sin[angle])(gravity)(mass)
F = ma
The Attempt at a Solution
Fnet = Fapp - Ff
Fnet = (38 * 9.81 * (sin50)) - (9*9.81*.12) - ((Cos50)*9.81*38*0.12)
Fnet = 246.1
F = ma
a = f/m
a = 246.21/(38+9)
a = 5.24m/s^2
My professor got 2.9m/s^2 and I can't see where (if) I'm going wrong. Help would be absolutely fantastic. Thanks!