To determine the number of neutrons in an atom, what must be done? a. add the atomic mass to the atomic number. b. add the atomic number to the number of protons. c. subtract the atomic number from the atomic mass. d. subtract the atomic mass from the atomic number.

In order for the bug to fly through the air a force has to push the bug forward. identify this force. how does the bug produce

Consider a system to be two train cars traveling toward each other. what is the total momentum of the system before the train cars collide?   kg • what must the total momentum of the system be after the train cars collide?   kg •  

Aboat radioed a distress call to a coast guard station. at the time of the call, a vector a from the station to the boat had a magnitude of 45.0 km and was directed 15.0° east of north. a vector from the station to the point where the boat was later found is = 30.0 km, 15.0° north of east. what are the components of the vector from the point where the distress call was made to point where the boat was found? in other words, what are the components of vector c = b - a?