# Static equilibrium exists sample problem 1 6 phys

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Static equilibrium exists:

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Sample problem 1 6 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 M com b a T 1 T 2 r 1 r 2 Static equilibrium exists: net torque is zero (1) net force is zero (2) What happens if b = a ? What happens if b = 0 ? What happens if b < 0 ? A block with mass M is hanging though two cords with same length. The distances between the hanging points and center of the block are a and b . Find tensions T 1 and T 2 of the cords.
Sample problem 2 7 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 m 1 a Four blocks with masses m 1 , m 2 , m 3 , m 4 are hanged as shown in figure, and stay in static equilibrium. The all left and right arms are a and 3a , respectively. Find three masses if the first mass is m 1 = 48 kg . 3a m 2 m 3 m 4

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Sample problem 2 8 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 m 1 a Four blocks with masses m 1 , m 2 , m 3 , m 4 are hanged as shown in figure, and stay in static equilibrium. The all left and right arms are a and 3a , respectively. Find three masses if the first mass is m 1 = 48 kg . 3a m 2 m 3 m 4 Static equilibrium exists: torques for the 1 st arm torques for the 2 nd arm torques for the 3 rd arm Solutions:
Sample problem 3 9 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010

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