Alex preforms a lab expiriment with a radio controlled cart. he measures the speed of the cart as it accelerates along a strait trach

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.

Aforklift raises a 1,020 n crate 3.50 m up to a shelf. how much work is done by the forklift on the crate? the forklift does j of work on the crate.

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2