A box is at rest with respect to the surface of a flatbed truck. The coefficient of static friction between the box and the surface is μs. (a) Find an expression for the maximum acceleration of the truck so that the box remains at rest with respect to the truck. Your expression should be in terms of μs and g. |a| = (b) How does your answer change if the mass of the box is doubled? The maximum acceleration doubles. The maximum acceleration is independent of the mass of the box. The maximum acceleration quadruples. The maximum acceleration is halved.

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?