Homework Help: physics

Posted by kj on Saturday, February 21, 2009 at 1:55am.

Two crates are connected by a massless rope that passes over a pulley as shown in the figure below. If the crates have mass 32 kg and 80 kg, find their acceleration. If the system begins at rest, with the more massive crate a distance 11 m above the floor, how long does it take for the more massive crate to reach the floor? Assume the pulley is massless and frictionless.

physics - Damon, Saturday, February 21, 2009 at 8:35am
total mass that must be accelerated = 112 kg
Total force doing the accelerating = 80*9.8 N = 784 N

a = F/m = 784/112
= 7 m/s^2

d = 11 = (1/2) a t^2
22 = 7 t^2
t = 1.8 seconds

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