Before the star that became sn 1987a exploded, it evolved from a red supergiant to a blue supergiant while remaining at the same luminosity. as a red supergiant, its surface temperature would have been approximately 4000 k, while as a blue supergiant, its surface temperature was 16,000 k. how much did the radius change as it evolved from a red to a blue supergiant?

Which statement is true for light passing into a medium that is more optically dense than the first medium through which it past

Hen a gfci receptacle device is installed on a 20-ampere branch circuit (12 awg copper), what is the minimum volume allowance (in cubic inches) required for conductor fill for each conductor in the outlet box?

Tafari worked one summer on a ship that set weather buoys in the ocean. he watched how one of the buoys moved in the water. describe which parts of the wave would cause the buoy to bob up and down. which wave property determined how fast the buoys bobbed in the water? he observed that when the wind blew harder, the ocean waves were larger, and the buoys moved away from the ship. what effect, if any, did the waves have on how far the buoys moved? explain your answer.