I will assume the inclined block wins and slips down the hill
Force up on inclined block = T
force down slope on inclined block = 28 (9.81 )sin 53 - 28 (9.81)(.9)cos53
a = acceleration down slope
28 a = 28 (9.81 )sin 53 - 28 (9.81)(.9)cos53 - T
Force down on hang mass = m g = 4*9.81
force up on hang mass = T
a = acceleration up
4 a = T- 4*9.81
or
28 a = 7 T - 28*9.81
so
28 (9.81 )sin 53 - 28 (9.81)(.9)cos53 - T = 7 T - 28*9.81
or
sin 53 - (.9)cos53 = 8 T/(28*9.81) - 1
or
8 T/(28*9.81) = 1 + sin 53 - (.9)cos53
solve for T
then go back and get a
then get d from
d = (1/2) a t^2
remember to multiply by 100 because it asks for cm, not meters
A block of mass m1 = 28 kg rests on a wedge of angle θ = 53∘ which is itself attached to a table (the wedge does not move in this problem). An inextensible string is attached to m1, passes over a frictionless pulley at the top of the wedge, and is then attached to another block of mass m2 = 4 kg. The coefficient of kinetic friction between block 1 and the plane is μ = 0.9. The string and wedge are long enough to ensure neither block hits the pulley or the table in this problem, and you may assume that block 1 never reaches the table. take g to be 9.81 m/s2.
The system is released from rest as shown above, at t = 0.
(a) Find the magnitude of the acceleration of block 1 when it is released (in m/s2).
(b) How many cm down the plane will block 1 have traveled when 0.50 s has elapsed?
1 answer