A load of bricks @ 部落格

標題:

A load of bricks

發問:

http://session.masteringphysics.com/problemAsset/1382494/8/YF-05-51_new.jpgA 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... 顯示更多 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

最佳解答:

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

其他解答: