7. Consider the statement “An extraterrestrial astronomer surveying our solarsystem with the Doppler technique could discover the existence of Jupiter with just a fewdays observation.” Does this statement make sense? Why or why not?
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7. Consider the statement “An extraterrestrial astronomer surveying our solar
system with the Doppler technique could discover the existence of Jupiter with just a few
days observation.” Does this statement make sense? Why or why not?
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- Match the following 1353 W/m2 -Global irradiance 10.3 x 106 watts -solar radiation absorbed in atmosphere 1kW/m2 -Solar power intercepted by earth 1.8 x 1011 MW -Solar irradiance outside atmospherea) The number of kilocalories in food is determined by calorimetry techniques in which the food is burned and the amount of heat transfer is measured. How many kilocalories per gram are there in a 5.00-g peanut if the energy from burning it is transferred to 0.500 kg of water held in a 0.100-kg aluminum cup, causing a 54.9C temperature increase? (b) Compare your answer to labeling information found on a package of peanuts and comment on whether the values are consistent.Saponification is a process wherein soap is added to a certain type of oil to produce grease. One such grease is said to have 75.7 % by volume oil and 24.3% by volume soap, wherein the oil and soap have densities 760 kgm/m3 and 6,250 kgm/m3, respectively. This kind of grease is sold by packs shaped like a sphere with a diameter of 20 cm for convenience. Calculate: a) the mass of oil per pack (kgm), b) the mass of soap per pack (kgm), c) the weight of each pack (kgf), d) the specific weight of grease (N/m3), e) will the grease float if it is placed in water whose density is 1000 kgm/m3? Explain.
- Geochemical Box Models - please use same terminology found in question Consider an element X exchanging between two geochemical reservoirs A and B. Let MA and MB be the masses of X in reservoirs A and B, respectively; let tA and tB be the residence times of X in reservoirs A and B, respectively. Further let M = MA + MB be the total mass of X in the two reservoirs combined. Consider a situation where additional mass M' is injected into reservoir A at time t=0 increasing the total amount of element X in the system from M0 to M1, with no further injection at later times; further assume that tA >> tB, that the total mass in the altered system is M1 = M0 + M', and that M0 << M'. Give an expression for MB(t) as a function of M1, tA, tB, and t. What is the characteristic time for MB to approach steady state? What is the characteristic time for MA to approach steady state?Over the ocean surface, the Bowen ratio is estimated to be about 0.2. Estimate the sensible heat and latent heat fluxes to the atmosphere, as well as the rate of evaporation, in millimeters per day, from the ocean surface, when the net radiation received just above the surface is 800W per m^2 , the heat flux to the water below 55 m is negligible, the rate of warming of the 55 m deep oceanic mixed layer is 0.12 deg. Celsius per day, and the sea surface temperature is 27deg. Celsius.The surface area of an unclothed person is 1.5m ^2 and thier skin tempature is 33 degree celcius. This ideal person is located in a room with a tempature of 65 dregrees F. and has an emissivity of e=0.95 suppose the room has dimensions 4mx9mx18m a) suppose you and your closest 10 friends come into this room and heat it up. suppose your clothes are in equilibium with your skin and have the same tempature and emissivity. Further suppose that your net power into the room remains constant . How long does it take before the room to get to hot say 95 degrees
- The sun's intensity at the distance of the earth is 1370 W/m2W/m2. 30%% of this energy is reflected by water and clouds; 70%% is absorbed. What would be the earth's average temperature (in ∘C∘C) if the earth had no atmosphere? The emissivity of the surface is very close to 1. (The actual average temperature of the earth, about 15 ∘C∘C, is higher than your calculation because of the greenhouse effect.) Express your answer to two significant figures and include the appropriate units.Radiative Heat Transfer. Two plane disks each 1.25 m in diameter are parallel and directly opposed to each other. They are separated by a distance of 0.5 m. Disk 1 is heated by electrical resistance to 833.3 K. Both disks are insulated on all faces except the two faces directly opposed to each other. Assume that the surroundings emit no radiation and that the disks are in space. Calculate the temperature of disk 2 at steady state and also the electrical energy input to disk 1. Hint: The fraction of heat lost from area 1 to space is (1 – F12).H4. Solar flux = 900 [w/m^2] h_air from glass cover = 25 [w/m^2-k] Emissivity_glass = 0.88 (nearly opaque to low frequency radiation Transmissivity of glass = 0.95 Alpha to incoming radiaiton = 0.9 T_ambient = 17 C Gap between plates = 25mm Bottom plate is insulated. Hr = radiation heat Hc = convective heat might need to use view factor FIND TEMPERATURE OF TOP SURFACE (the top is the glass) If anything is needed let me know i will try my best to update the question
- The sun is the only star whose size we can easily measure directly; astronomers therefore estimate the sizes of other stars using Stefan's law. The spectrum of the star Betelgeuse, plotted as a function of energy, peaks at a photon energy of 0.8 eV, while Betelgeuse is approximately 10,000 times as luminous as the sun. How does the radius of Betelgeuse compare to the sun's radius? Why is Betelgeuse called a "red supergiant"?Pertaining to Lab 3 Q14, why is the peak net radiation approximately the same on the two dates seen in figures 3-5 and 3-6? The weather conditions must have been the same on those dates (i.e. clouds, pressure, temperature, etc.) The data for both days must have been taken on surfaces with the same albedo Botswana is right on the equator so it has very little variation throughout the year The latent heat, sensible, heat, and soil fluxes when averaged together are about the same on both days The sun angles are similar on both datesSuppose city 1 leaves an entire block (100 mm ×× 100 mm) as a park with trees and grass (emissivity 0.96) while city 2 paves the same area over with asphalt (emissivity 1.0). Sunlight heats each surface to 41.5 ∘C∘C by sunset, and then the surface radiates its heat into a cube of air 100 mm on a side and at 30.0 ∘C∘C. If each city block maintains the same radiated power for 2.1 hh and there are no other energy losses, what is the final temperature of the cube of air above the block in city 1? The density of air at 30.0 ∘C∘C is 1.16 kg/m3kg/m3. Express your answer to three significant figures and include appropriate units. If each city block maintains the same radiated power for 2.1 hh and there are no other energy losses, what is the final temperature of the cube of air above the block in city 2? The density of air at 30.0 ∘C∘C is 1.16 kg/m3kg/m3. Express your answer to three significant figures and include appropriate units.