Which explains why a gas does not have a fixed shape?
select one:
a. the particles have very high speeds.
b. the particles are not compressible.
c. the particles are charged.
d. the particles vibrate.

A-4.60 μc charge is moving at a constant speed of 6.80×105 m/s in the +x−direction relative to a reference frame. at the instant when the point charge is at the origin, what is the magnetic-field vector it produces at the following points.

Match each vocabulary term to its definition. 1. electrons neutral subatomic particles found in the nucleus of the atom 2. neutron lowest energy position of an electron in an atom 3. photon the path of an electron around the nucleus of an atom 4. ground state negatively charged, subatomic particles 5. protons packet of energy of specific size 6. element substance with only one type of atom 7. orbital positively charged, subatomic particles found in the nucleus of the atom

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration