A 9.00-m-long uniform beam is hinged to a vertical wall and held horizontally by a 5.00-m-long cable attached to the wall 4.00 m above the hinge (Fig. E11.17). The metal of this cable has a test strength of 1.00 kN, which means that it will break if the tension in it exceeds that amount. (a) Draw a free-body diagram of the beam. (b) What is the heaviest beam that the cable can support in this configuration? (c) Find the horizontal and vertical components of the force the hinge exerts on the beam. Is the vertical component upward or downward?
PHYS 242 BLOCK 4 NOTES Sections 27.1 to 27.7, 27.9 Consider a freely-pivoted compass needle(or a bar magnet) in the earth’s magnetic field. The magnetized object’s north pole (N-pole) points geographically north and itssouth pole (S-pole) points geographicallysouth (neither exactly so). Consideringthe earth as a magnet,currently its south magneticpole is located near its north geographic pole and vice versa (see Fig.27.3). F = q E defines the electricfield E and F = qυ × B defines the magnetic field B . This vector 0 0 equation tells us that anynon-zeroF is perpendicular toboth υ and B . Also, F is in the same direction as υ → → → × B for positive charge and oppositeυ × B fo