If a galaxy is 8.6 Mpc away from Earth and recedes at 511 km/s, what is H. (in km/s/Mpc)? km/s/Mpc What is the Hubble time (in yr)? years How old (in yr) would the universe be, assuming space-time is flat and the expansion of the universe has not been accelerating? years
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- Carbon-14 (14C) is a radioactive isotope of carbon with a half-life of 5730 years—meaning that half of the 14C in a sample decays into 14N during that time. Suppose a scientist analyzes a sample of ancient plant material from a bog and finds that it contains 1/8th as much 14C as when it formed. Roughly how old is the sample? _____ yearsList the following 5 terms in order through a stars life cycle (starting with the sun), through the remainder of its lifetime: a. Black dwarf b. Planetary nebula c. Red giant d. Star (Sun) e. White dwarfequattion : S/4 (1- a) = f*sigma*TS4 Solar Constant (W/m2) S = 1361 How sensitive is the temperature of the earth to changes in the atmospheric transmissivity (f)? The atmosphere is more transmissive (lets more radiation through) when CO2 and other greenhouse gases are lower. During the pre-industrial period, transmissivity (f) was probably around 62% (f = 0.62) and has been decreasing. Calculate how much the Earth's surface temperature would change if the transmissivity changes by ±0.01 (to 0.60 or to 0.62). ___ °C per 1% transmissivity change.
- using wiens law 600nmA) A typical dust grain has a radius of about 0.1 micrometers and a mass of 10-14 grams. Roughly how many dust particles are in a cloud containing 1000 Msun of dusty gas if 1% of the cloud's mass is in the form of dust grains? B) What surface area would be covered by these grains if you put them side by side? Assume these grains are spherical. Answer in square light-years. C) Estimate the total surface area covered by the cloud assuming it's matter density is like that of a typical molecular cloud, about 10-21 g/cm3 (Hint: first calculate the clouds volume from it's mass and density, then determine its radius using the formula for volume of a sphere) Answer in square light-years. D) Comparing all above answers, What are the chances (very roughly) that a photon passing through the cloud will hit a dust grain?x VU Password Changed Successfully X G W to MW - Google Search X New Tab to Outlook X VL MyNova on.com/?courseld=12688482&key=15593214601713132713112024#/ y Symbaloo Living Biography Es... lowa AEA Online -... Typing Lessons | Lea... https://my.hrw.com... RenWeb > Logins>... Part A In a hydroelectric dam, water falls 35 m and then spins a turbine to generate electricity. Vocals Q Search What is AU of 1.0 kg of water? Express your answer with the appropriate units. View Available Hint(s) AU=340 J Previous Answers - Part B Correct SOLVE The change in the potential energy of 1.0 kg of water in falling 35 m m is AU mgh= (1.0 kg)(9.8 m/s)(35 m) -340 J + ☆. Suppose the dam is 80% efficient at converting the water's potential energy to electrical energy How many kilograms of water must pass through the turbines each second to generate 47 MW of electricity? This is a typical value for a small hydroelectric dam, Express your answer in kilograms per second. View Available Hint(s) ΜΕ ΑΣΦ Submit…
- T/ F The distance unit best for interstellar distances is the light-year. ___ The distance unit best for intergalactic distances is the mega-parsec. ___Hydrostatic Equilibrium replies on which of the following to happen? (choose all that apply) Internal pressure from fusion to push out. The outward pull of gravity from the Sun O Gravity to pull inwards. The fusion of Helium into Carbon The start of the CNO Cycle in stars.There are two parts to this question. I need to know how many times fainter Venus is from a distance of 6 pc and what the apparent magnitude would be as well! Thank you!!