A load of bricks

2013-06-16 8:54 pm
http://session.masteringphysics.com/problemAsset/1382494/8/YF-05-51_new.jpg

A load of bricks with mass m_1 = 14.2kg hangs from one end of a
rope that passes over a small, frictionless pulley. A counterweight of
mass m_2 = 28.8kg is suspended from the other end of the rope, as
shown in the figure. (Figure 1) The system is released from rest.

the magnitude of the upward acceleration of the load of bricks
is 3.33 m/s^2.
What is the tension in the rope while the load is moving?
unit: N

回答 (1)

2013-06-16 9:44 pm
✔ 最佳答案
Let Tbe the tension in the rope.
Consider the load of bricks, net force = T - (m1)g = T - 14.2g = T - 142 N
where g is the acceleration due to gravity, taken to be 10 m/s^2

Hence, T - 142 = 14.2 x 3.33
T = 189 N



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