Aforce of 16.0 newtons is sufficient to set a box that is at rest into motion. if the coefficient of static friction is 0.380, what is the normal force acting on the box?

6.08 newtons
16.0 newtons
16.4 newtons
42.1 newtons

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Alinearly polarized electromagnetic wave has an average intensity of 196 w/m^2. this wave is directed towards two ideal polarizers (in real polarizers, transmission is also effected by reflection and absorption). polarizer a is oriented with its transmission axis at an angle of θ_1=20.8∘ with the incident electric field. polarizer b has its axis at an angle of θ_2=63.0∘ with the incident electric field. what is the average intensity of the wave after it passes through polarizer a? what is the average intensity of the wave after it passes through polarizer b? suppose that the two polarizers a and b are interchanged. what would the average intensity be after passing through both polarizers?