Convert your weight. (1 lb = 4.45 N) Show your work.

Which of the following is considered to be a vector?               a.  temperature    b.  velocity    c.  time    d.  mass

A150 w lamp emits light of wavelength 590 nm uniformly in all directions. what is the photon flux (photons per unit area per unit time) on a small screen at a distance 2.3 m from the lamp? assume the photons are uniformly distributed over the surface of a sphere of radius 2.3 m.

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge