The cross section for scattering a certain nuclear particle by a copper nucleus is 2.0 barns. If 109of these particles are fired through a copper foil of thickness 10 gm, how many particles are 588 Chapter 14 Collision Theory scattered

The bar of prob. 5/82 is repeated here. the ends of the 0.4-m bar remain in contact with their re- spective support surfaces. end b has a velocity of 0.5 m/s and an acceleration of 0.3 m/s2 in the di- rections shown. determine the angular accelera- tion of the bar and the acceleration of end a.