Two or more explanatory variables that are not separated best describes which of the choices below?

a) lurking variable
b) confounding variable
c) simpson's paradox
d) extrapolation

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?

Diamond will scratch quartz. true or false

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up