Light impinges on a metal which has a work function of 2.0 eV, and electrons are
emitted with velocities up to a maximum of 6000000 m/s.
(a) What is the frequency of the light?
(b) What is the minimum frequency of light needed to produce any photoelectrons?

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

Automobile fuel efficiency is often measured in miles that the car can be driven per gallon of fuel (mpg). heavier cars tend to have lower fuel efficiencies (lower mpg ratings). which variable (weight or fuel efficiency) is most naturally considered the explanatory (predictor) variable in this context?

If a substance is in the gas phase, which of qualities of the gas will stay constant? a: volume b: mass c: shape d: position of particles