What two types of particles exist within an atomic nucleus?
select one:
a. protons and neutrons
b. protons and neutrinos
c. positrons and neutrons
d. neutrons and electrons

In the united states, tornadoes generally occur because of the freezing of ocean water underwater earthquakes meeting of cool and warm air masses shifting of warm and cool ocean currents

The unit of resistivity is the: ohm ohm-cm volt coulomb

3. a particle with initial velocity v⃗ 0=(5.85×103m/s)j^ enters a region of uniform electric and magnetic fields. the magnetic field in the region is b⃗ =−(1.35t)k^. you can ignore the weight of the particle. a. calculate the magnitude of the electric field in the region if the particle is to pass through undeflected, for a particle of charge +0.640 nc.