Help with Astronomy questions?
In a measured radial velocity curve, the "velocity" being plotted is the speed of what object exactly? 1)the star with respect to Earth 2)the star with respect to the exoplanet 3)the exoplanet with respect to host star 4)the exoplanet with respect to Earth --- w*f=c Your GPS receiver operates on the frequency around 1600 MHz (1 MHz = 1 million cycles/second). Using the above formula, approximately what wavelength of light does this frequency correspond to? Please help and thanks!
Astronomy Question- Need help?
____ 4. Which of the following people did not accept a heliocentric model of the universe? a. Kepler b. Copernicus c. Tycho d. Galileo e. Aristarchus I have tried to look this one up, but can not find it. Anyone positive they know the answer?
Astronomy question help?
In high mass stars, one of the fusion reactions that takes place is oxygen fusing into sulfur: 16O + 16O → 32S + energy. The mass of 16O is 2.6567 × 10−26 kg, and the mass of 32S is 5.3090 × 10−26 kg. How much energy, in Joules, is released for every 1 kg of oxygen that is fused into sulfur?
Astronomy questions help?
1) What is the absolute minimum amount of energy it would take to launch a person into space? Assume you launch just a human with mass of 50 kg and you need to reach Earth's escape speed (11.2 km/s). E= 0.5mv^2 E=kinetic energy in joules m=mass in kilograms v=velocity in meters/sec 2) An average American continuously uses about 1 kilowatt of electricity = 1000 Joules per second. How many DAYS worth of average American electricity use is equivalent to the answer in the last problem? Thank you!
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How much fossil fuel, uranium for a fission reactor, or hydrogen for a fusion reactor would one need at 100 percent efficiency to power this craft (Hydrogen nuclear fusion gives 0.007mc2 energy for a given mass m, fission gives 0.001mc2, and fossil fuels are 1 million times less energy per kg than fission). (KEt = KE1 + KE2 = 1.337E+12kg·c²) This is obviously a lower limit and does not account for any energy required to keep the crew alive for centuries. Describe some analogies or comparisons that give a sense of scale as to how large the energetic requirements are (e.g., how large would the mass of hydrogen to fuse need to be - given that only 2/18 of water ice is hydrogen, how large would the comet need to be that you drag along with you as fuel?; how many years supply of uranium would be needed for fusion? How does the amount of fossil fuel required compare with the world supply of coal?)
Astronomy question:?
A 20-solar-mass blue supergiant with a surface temperature of 40000 K becomes a red supergiant with the same total luminosity and a temperature of 3900 K. By what factor does its radius change? Express your answer using two significant figures.
Homework help, need help on astronomy question?
1/4...force of gravity varies inversely with the square of the distance. F1 is force of gravity between jupiter and earth at current distance R1 F1 proportional to 1/R1^2 if you make R2 = 2*R1 (the new distance of jupiter...twice as far away) then F2 proportional to 1/R2^2 = 1/(2*R1)^2 = 1/4 * 1/(R1^2)
Astronomy question, need answer please help?
If the orbit were a perfect circle it would be D. The planet's velocity vector would constantly be changing in direction but constant in speed. This is what acceleration does to a body that is moving perpendicular to the acceleration. However, all planetary orbits are elliptical (Kepler's 1st law) If acceleration is directed in the same direction as your velocity, you speed up. No effect on direction. If acceleration is opposite your velocity you slow down. Again, no effect on direction. Everything else is acceleration at an angle and you change in both direction and speed. This is what planets do. You are moving away from the perihelion and therefore moving away from the sun. You are slowing down. Therefore acceleration is angled opposite to your velocity and the answer is A.
Astronomy Question- Difficult please help?
This is a review question that may be on my final. I can not find the answer anywhere in my book. I was hoping someone may be able to help. Thanks What evidence supports the contention that other sun-like stars also show a spot cycle much like our sun's sunspot cycle? a. the variation in the rotation rates of sun-like stars b. the variation in the nuclear reaction rates in sun-like stars c. the variation in the strength of the H and K emissions in the spectra of sun-like stars d. the variation in the parallax of sun-like stars e. the variation in the color of sun-like stars
Astronomy question regarding atmosphere..please help?
That is kind of a dull approximation for Earth's atmosphere. Mt Everest peaks at just over 8.8 km above sea level. It is like saying once you reach the peak of Everest, then there is no atmosphere! Using the values above, you need to find the volume of Earth's atmosphere. You subtract one sphere from another. Volume (Earth + atmosphere) - Volume (Earth) = Volume (Atmosphere) Density = mass / volume