A seccaw consutng M. Mp and md 1aspectively o board unifoim and length suppat a fother ond o'daughter with fother and to deughter with figule the mass Masser ar shouwn n the figuie below The board the fother fother the danghter is support s under the centio f grevity. dutence d distance to the rente the centro from from and d. the upward force esatod D/Deteimine the magnitude of the upuord foice n exeitel by the support N= Mgt M4g +Mdg N = (M +M Md)g Npimal on the board foice OICE by support 6/ Detamine the fother should sit to balame the system. were

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Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.