Diamonds have ionic bonds

Classify the triangle connecting the points P(-1,3,1)P(-1,3,1), Q(1,-1,4)Q(1,-1,4), and R(0,5,3)R(0,5,3) as right, acute, or obtuse. Do this by finding the angles between each pair of sides.

Suppose a material (non-composite) has an ultimate strength of 150 MPa and a yield strength of 80 MPa, what does this imply about the material?

In steel making, what is the purpose of adding calcium carbonate to the iron?

What do rubber bands, car tires, and silicone gaskets all have in common?

You have two parts that need to mate together well as you are assembling a machine. Suppose one had a pin installed in it that needs to fit into a hole on the other part, but it is not able to because the hole is too small for the pin to slide into it. What is this kind of error called? 

What is a datum?

What is the main reason why ceramic parts are often used in electrical grids and to help hang power lines?

At room temperature and normal operating conditions, large grain size in a metal generally means the metal has poor mechanical properties and rough-looking appearance. 

What are the standard units for time, mass, and distance in the SI system?