M d. Cylinder uf weight W acted an by couple M. The surfaces at A and B are rough. c. quferm bar of mass m and roller of mass mo taken together. Subjected to couple M and supported as shown. Roller is free to turn a. Uniform herizontal bar of mass m suspended by vertical cable 31A and supported by rough inclined surface at B. ' b. Wheel of mass m on verge of being rolled over curb by pull P. c. Uniform heavy plate of mass m supported in vertical plane by cable C and binge A