A box is sitting on the floor. The box was then pulled with a force, Ft. The box did not move. The free-body
diagram of the box is shown.
Which describes the motion of the box based on the
resulting free-body diagram?
It is moving up with a net force of 20 N.
It is moving to the right with a net force of 10 N.
It is in dynamic equilibrium with a net force of O N.
It is in static equilibrium with a net force of O N.
F, = 20 N
F, = -10 N
F, = 10 N
F = -20 N

Nacidified solution was electrolyzed using copper electrodes. a constant current of 1.18 a caused the anode to lose 0.584 g after 1.52 ✕ 103 s. given that the charge of an electron is 1.6022 ✕ 10−19 c, calculate avogadro's number. assume that copper is oxidized to cu2+ ions.

Smallest intensity of a stimulus that you can detect 50 percent of the time is

Ultraviolet radiation is dangerous because it has a high enough energy to damage skin cells. what is the best explanation of the relationship between wavelength and wave energy? a) wave energy is related only to frequency, not wavelength. b) longer wavelengths have lower frequencies but higher energy. c) the shorter the wavelength, the lower the frequency and the higher the energy. d) the shorter the wavelength, the higher the frequency and the higher the energy.