2points
which of the following best describes internal energy?
d
a. the difference between the kinetic and thermal energies of the
particles in a system
o
b. the sum of the kinetic and potential energies of the particles in a
system
c. the difference between the kinetic and potential energies of the
particles in a system
o
d. the sum of the kinetic and thermal energies of the particles in a
system

Match the atomic particles with their characteristics. 1. made of two protons and two neutrons neutron 2. similar to an electron; positive charge neutrino 3. orbits nucleus; negative charge positron 4. bundle of energy; zero charge proton 5. found in nucleus; positive charge meson 6. very unstable; +, -, or zero charge gamma 7. found in nucleus; zero charge electron 8. negative particle; negative charge beta 9. atomic energy converted to mass alpha

Suppose a wire with a current is pushed upward by a magnetic field. how would the wire move if the direction of the current reversed? explain your answer.

An ionic compound can conduct electricity when a it is dissolved in water b its crystals are ground into powder c it is in solid form d it is heated to just below its melting point