In some movies where we see people in space, they sometimes show “gravity” being generated by rotating a cylindrical object at some rotational velocity. (a) let’s say that this “space wheel” has a diameter of 165 m and a rotational period of 19 seconds. based on this, what is the apparent gravity for someone walking on the walls? [5 points] (b) what is causing this artificial gravity? further, we see this being effective for generating gravity in movies, but it is not useful in real life. why not?to put michael bay and ridley scott in their respective places!

What must be the same for any two resistors that are connected in series ? a. the potntial diffrence across each b. the rate at which charge moves through each c. the rate at which energy is used by each d. the resistance to the flow of charge of each

Antireflective coatings on solar cells are often made by applying a thin film of silicon nitride (sinx), which has an index of refractive of 1.2, on the top of the silicon solar cell, which has a refractive index of about 3.5. however, the sun emits radiation of various wavelengths which the solar cell absorbs, and the antireflective coating can only absolutely minimize the reflection of one of these wavelengths. the coating thickness is chosen to reduce the reflection of green/yellow light (e = 2.2 ev), which is the most intense color in the solar spectrum (shown below). which of the following coatings would minimize reflection of green/yellow light? the answer is 820 nm how? what is the angular width of the central maximum of an electron traveling at 2 x 108 m/s going through a single slit of width 1 mm.

Could we see a galaxy that is 20 billion light-years away?