A 10 kg ball is fired with a velocity of 500 m/sec from a 1,000 kg cannon. What is the recoil velocity of the cannon

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?

What are two different ways you could find the value of a? explain these methods.

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration