Quasars arise when supermassive black holes swallow nearby gas, or even entire stars. Their masses are typically 107 Mo (solar masses), and their luminosities are typically around 1039 W. Hide the children! Roughly how many stars must one of these monsters eat per year

Select the word from the list that best fits the definition classification of most stars on the h-r diagram

When a vertical beam of light passes through a transparent medium, the rate at which its intensity i decreases is proportional to i(t), where t represents the thickness of the medium (in feet). in clear seawater, the intensity 3 feet below the surface is 25% of the initial intensity i0 of the incident beam. what is the intensity of the beam "10" feet below the surface? (give your answer in terms of i0. round any constants or coefficients to five decimal places.)

Arigid tank is divided into two equal parts by a partition. one part of the tank contains 3 kg of compressed liquid water at 400 kpa and 60°c while the other part is evacuated. the partition is now removed, and the water expands to fill the entire tank. determine the entropy change of water during this process, if the final pressure in the tank is 40 kpa. use steam tables.