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To explain some peculiar experimental results, Einstein assumed that the speed of light is a constant regardless of our motion through space. We are not responsible for and do not endorse or warrant any materials, information, goods or services available through any linked websites. If a weight of 10 N is hanged from the 30 cm mark and a weight of 20 N is hanged from its 60 cm mark, find out whether the meter rule will remain balanced about its pivot or not? τ 1 = 10 (0.2) = 2 N.m τ 2 = 20(0.1) (-) = - 2 N.m The meter rule will balance -The net torque on the pulley about the axle is the torque due to the 30 N force plus the torque due to the 20 N force τ 1 = 20(r)sin(90) = 20r N.m τ 2 = 30(r)sin(-90) =-30r N.m τ = -10r Examples 43 -Find the total torque at point A then B Around A: τ = 0 + 80(0.5 L)sin(37) + 70(L)sin(120) + 0 + 60(0.5L) sin(-90) τ = 0.3L + 60.6L – 30L = 60.9 L mN Around B: τ = 90Lsin(-140) + 80(0.5 L)sin(-143) + 0 + 0 + 60(0.5L) sin(90) τ = -57.9L - 24.1L + 30L = -52L mN Examples 44  A propeller (arm length 1.2 m) starts from rest and begins to rotate counterclockwise with a constant angular acceleration of size 2.7 rad/s 2. a.

Pages: 415

Publisher: Amer Society of Mechanical (January 1999)

ISBN: 079180027X

Structural Reliability: Statistical Learning Perspectives (Lecture Notes in Applied and Computational Mechanics)

Relativity: The Theory and Its Philosophy

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