How are doctors both accurate and precise when preforming surgery or other things?

Ahowler monkey is the loudest land animal and, under some circumstances, can be heard up to a distance of 4.6 km. assume the acoustic output of a howler to be uniform in all directions and that the threshold of hearing is 1.0 × 10-12 w/m2. what is the acoustic power emitted by the howler

Gunpowder residue is most likely to show up where on a shooters hands

What is the final velocity of the initial velocity of 25 and -50?