Astronomy
1st Edition
ISBN: 9781938168284
Author: Andrew Fraknoi; David Morrison; Sidney C. Wolff
Publisher: OpenStax
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Chapter 12, Problem 4E
Explain the energy source that powers the volcanoes of Io.
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The fraction of the energy flux received which is reflected into space is the albedo of Venus, av, which is about 0.76. The fraction of the energy flux which is absorbed is then (1-av) = 1. - 0.76 = 0.24. So the amount of energy actually absorbed by Venus in each second is Lv = (1-av)Ev.
Lv = (1-av)Ev = ___________________ ergs/s
And next calculate the effective temperature of Venus:
Tv4 = (Lv/(4pdv2))/s = Lv/(4spdv2) = __________________ K4
and taking the square root of Tv4 twice in succession we get the effective Temperature Tv:
Tv = [Lv/(4spdv2)]0.25 = _________________ K
Calculate Venus' emittance assuming that the Venus' actual temperature, Tvr, is 472o C = 745 K:
ev = Lv/(4pdv2s Tvr4) = __________________ .
1
Calculate the escape velocity of Titan.
Chapter 12 Solutions
Astronomy
Ch. 12 - What are the moons of the outer planets made of,...Ch. 12 - Compare the geology of Callisto, Ganymede, and...Ch. 12 - What is the evidence for a liquid water ocean on...Ch. 12 - Explain the energy source that powers the...Ch. 12 - Compare the properties of Titan’s atmosphere with...Ch. 12 - How was Pluto discovered? Why did it take so long...Ch. 12 - How are Triton and Pluto similar?Ch. 12 - Describe and compare the rings of Saturn and...Ch. 12 - Why were the rings of Uranus not observed directly...Ch. 12 - List at least three major differences between...
Ch. 12 - The Hubble Space Telescope images of Pluto in 2002...Ch. 12 - Saturn’s E ring is broad and thin, and far from...Ch. 12 - Why do you think the outer planets have such...Ch. 12 - Ganymede and Callisto were the first icy objects...Ch. 12 - Compare the properties of the volcanoes on Io with...Ch. 12 - Would you expect to find more impact craters on Io...Ch. 12 - Why is it unlikely that humans will be traveling...Ch. 12 - Why do you suppose the rings of Saturn are made of...Ch. 12 - Suppose you miraculously removed all of Saturn’s...Ch. 12 - We have a lot of good images of the large moons of...Ch. 12 - In the Star Wars movie Star Wars Episode VI:...Ch. 12 - Which would have the longer orbital period: a moon...Ch. 12 - How close to Uranus would a spacecraft have to get...Ch. 12 - Saturn’s A, B, and C Rings extend 75,000 to...Ch. 12 - Use the information in Appendix G to calculate...Ch. 12 - The average distance of Enceladus from Saturn is...
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- Compare the properties of the volcanoes on Io with those of terrestrial volcanoes. Give at least two similarities and two differences.arrow_forwardWhat should the interior composition of Titan be if its density is 1.9 g/cm3? How do you know?arrow_forwardInfrared observations indicate that Saturn gives off 2.8 times the energy it receives from the Sun for a total internal power loss of 2 x 1017 W. Assume that gravitational contraction releases this thermal energy. How much must Saturn shrink per year to account for this output?arrow_forward
- Describe sources and sinks of CO2, if any, on Venus today.arrow_forwardWe believe that chains of comet fragments like Comet Shoemaker-Levy 9’s have collided not only with the jovian planets, but occasionally with their moons. What sort of features would you look for on the outer planet moons to find evidence of such collisions? (As an extra bonus, can you find any images of such features on a moon like Callisto? You can use an online site of planetary images, such as the Planetary Photojournal, at photojournal.jpl.nasa.gov.)arrow_forwardWhich of the following events can NOT be explained by a giant impact event? The large metallic core of Mercury The extreme axis tilt of Uranus The formation of the Moon The backwards rotation of Venusarrow_forward
- The iron meteorite that created Barringer Crater (Arizona) was 50 m in diameter. It caused a crater 1.2 km (1200 m) in diameter, that is, 24 times bigger than the impactor. Keeping in mind that the size of the crater depends on many factors, such as the type of rocks present in the area, estimate the approximate size of the impactor that produced Mare Serenitatis.arrow_forwardAllarrow_forwardTitan is a moon of Saturn. Titan has wind erosion features. Would you expect Titan to have an atmosphere?arrow_forward
- d) The internal density of the comet 67P was measured by the Rosetta space-craft to be approximately p = 400 kg m-³. How close an approach to the Earth could be made by this comet before it is tidally disrupted? Express your answer in units of the Earth's radius. Ignoring the effects of heating and sublimation, state how close this comet could approach the Sun without being tidally disrupted. Express your answer in units of the Solar radius.arrow_forwardWhat evidence can you give that Mercury has a partially molten, metallic core?arrow_forwardThe Tunguska asteroid is estimated to have had a diameter of 50 m, and to have produced an explosion equivalent to 10 megatons of TNT (1 megaton = 4.2 x 1015 joules). Assume that the asteroid was a sphere with density 2 g/cm3. Using the kinetic energy formula K = ½ mv2, where m is the mass and v is the speed, to estimate the speed of the asteroid. Assume that all kinetic energy is converted into the energy of the explosion. Give your answer in km/s with one significant figure.arrow_forward
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