4. Which of the following substance will cool off the fastest? cooper
Iron
Nylon
Aluminum

The gun from the crime scene shows tool marks where the serial numbers are ground off. there are also tool marks on the bullets left behind. what information can the tool marks on the bullets and gun provide about the crime? what type of evidence does this information provide, individual or class?

Derive the lens makers formula for convex les?

10 application of ultra sound waves?