- #1
maestro3000
Homework Statement
A system comprising blocks, a light frictionless pulley, and connecting ropes is shown. The 9-kg block is on a
smooth horizontal table (μ = 0). The surfaces of the 12-kg block are rough, with μ = 0.30.
In Fig. 5.7, the mass M is set so that it descends at constant velocity when released. The mass M is closest to: A) 2.4 kg B) 3.3 kg C) 3.0 kg D) 3.6 kg E) 2.7 kg
Homework Equations
F = MA
F_u = uN
The Attempt at a Solution
F = (m_1*g) - (m_2*g - u*m_3*g)
since the system is in equilibrium, F = 0
m_1 = m_2 - m_3*u
m_1 = 9 - (12)(.3)
m_1 = 5.4 kg