Which of the following results in a magnetic field? (select all that apply)
a.
a stationary electric charge
b.
a moving electric charge
c.
an unchanging electric charge
d.
a changing electric field

An electron and a proton have the same kinetic energy upon entering a region of constant magnetic field and their velocity vectors are perpendicular to the magnetic field. suppose the magnetic field is strong enough to allow the particles to circle in the field. note: you'll need to look up the masses for an electron and proton. 1) what is the ratio of the radii of their circular paths rp/re?

Which of the following is not a part of the respiratory system? a. pharynx b. trachea c. pancreas d. larynx

Which statement is true? a. kepler's laws apply only to the motion of earth. b. kepler's laws can be used to predict eclipses. c. kepler's laws are true for a central force that is directly proportional to distance. d. kepler's laws can be deduced from newton's laws of motion and gravity.