i have just invented bed sheet that clean your body while you sleep. which step of the engineering design cycle do i need to work on to identify my target audience?

An ideal polarizer with its transmission axis rotated 30 degrees to the vertical is placed in a beam of unpolarized light of intensity 10w/m^2. after passing through the polarizer, what is the intensity of the beam? a. 8.7 w/m^2 b. 7.5 w/m^2 c. 5.0 w/m^2 d. 10 w/m^2 e. 2.5 w/m^2

Which of the following are guidelines to follow for obtaining accurate observations

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?