Physics URGENT!!!
posted by Anonymous .
Two packing crates of masses 7.93 kg and 5.13 kg are connected by a light string that passes over a frictionless pulley as in the figure below. The 5.13 kg crate lies on a smooth incline of angle 40.0°.
a) Find the acceleration of the 5.13 kg crate
B)Find the tension in the string

m2•a=T  m2•g•sinα => T= m2•a + m2•g•sinα
m1•a=m1•g – T= m1•g  m2•a  m2•g•sinα.
a=g•(m1m2•sinα)/(m1+m2) = 9.8•(7.935.13• sin40°)/(7.93+5.13) =
=3.48 m/s²,
T= m1(ga)= 7.93•(9.83.48) = 50.15 N.