Which of the following is usually done first in the scientific method of investigation? a.) do research on a particular topic b.) ask a question based on an observation c.) construct a hypothesis to be tested d.) test with an experiment

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

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 is the equation for electrical work?