€ Wash is using an old fashioned motorized spring contraption to load cargo into a spaceship. If he
attached a spring with a spring constant of 250 N/m to a 150 kg crate which is 6.5 m from the spring
contraption and the crate experiences an average acceleration of 5.6 m/s?, what is the maximum
frictional force experienced by the crate? What is the frictional coefficient between the crate and the
ground?

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?