I am 7th grade and need help doing the bill Nye waves worksheet.

Asteady current of 1 ais flowing through a conducter calculate the number of electrons that flows through conductor in 1second

Atrain departs from its station at a constant acceleration of 5 m/s. what is the speed of the train at the end of 20s?

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?