Which element is always found in bioclastic sedimentary rocks?

What is friction? how does it affect the motion of an object?

Are good conductors of heat also good conductors of electricity? explain your answer.

The signboard truss is designed to support a horizontal wind load of 735 lb. a separate analysis shows that 5/8 of this force is transmitted to the center connection at c and the rest is equally divided between d and b. calculate the forces in members be and bc. the forces are positive if in tension, negative if in compression.