What type of Gaussian surface is best to determine the electric field from a large (ignore edge effects) sheet of charge

Protons and neutrons are found within the nucleus of an atom

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

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?